Table of Contents

Locator Record

Title: Dual-Energy X-ray Absorptiometry Second Day Exam (DXX_2_00 )
Contact Number: 1-866-441-NCHS
Years of Content: 2000 - 2000
First Published: June, 2010
Revised: NA
Access Constraints: RDC Only
Use Constraints: RDC Only
Geographic Coverage: National
Subject:Dual-Energy X-ray Absorptiometry, Second Day, DXA, DXX, Body Scan
Record Source: NHANES 2000 - 2000
Survey Methodology: NHANES 2000 - 2000 is a stratified multistage probability sample of the civilian non-institutionalized population of the U.S.
Medium: NHANES Web site; SAS transport files

Component Description

The NHANES 2001-2002 Second Day Dual-Energy X-ray Absorptiometry Exam was conducted for quality assurance and research purposes in the NHANES mobile examination center (MEC) in 2000 through 2002. The procedures for the second day exam were the same as those for the primary exam and can be found in the Body Composition Procedures Manual located on the NHANES website. Second day DXA data for 2000 can be accessed only through the National Center for Health Statistics Research Data Center.

No statistical sampling was applied for selection of second day exam participants; the sample was self-selected and nonrandom. For the second day exam, the MEC staff recruited participants aged 16-69 years, approximating percentages in demographic categories for the primary exam. Participants were given the option to decline the second exam. In general, about 11% of those who completed the first exam also completed the second exam. Seven hundred fifty (750) participants completed the second day DXA exam.

Participants were asked to come for the second day exam at least 8 days after their first exam. The second day exams were conducted during the same time period as the primary exams for a particular survey stand or location. The same radiology technologist who conducted the second day exam was not always the same as the technologist who conducted the first exam. Participants were remunerated for the second day exam.

Missing and invalid DXA data from the second day exam were not multiply imputed as were data from the primary exam. The second day DXA data file (DXX_2_B) contains only 1 record for each survey participant. Users of the second day DXA data (DXX_2_B) are encouraged to read this documentation before accessing the data file.

The second day DXA scans provide bone and soft tissue measurements for the total body, for both arms and both legs, the trunk, and head. Bone measurements also were obtained for the pelvis, left and right ribs, thoracic spine, and lumbar spine. Values for the total body and regions include:

The second day exam data file also contains variables on the number of days between the primary and second day exams and whether the same technologist conducted both primary and second day exams or whether different technologists conducted the two exams.

Eligible Sample

The second day DXA scans were administered to eligible survey participants aged 16-69 years in 2000-2002 who had completed the primary exam. Participants excluded from the primary DXA examination for reasons other than pregnancy, such as self-reported history of radiographic contrast material (barium) use in past 7 days, weight over 300 pounds, or height over 6’5 (limitations of the DXA table), were considered to be eligible nonrespondents. Pregnant females were not eligible for the DXA exam.

DXAEXSTS – examination status variable
1 = Scan completed
2 = Scan completed, but invalid

Protocol and Procedure

Whole body DXA scans were taken with a Hologic QDR-4500A fan-beam densitometer (Hologic, Inc., Bedford, Massachusetts). Hologic software version 8.26:a3* was used to administer all scans. The densitometer scanned participants with an x-ray source using fan-beam scan geometry in three passes (1 minute per pass). The participants were positioned supine on the tabletop with their feet in a neutral position and hands flat by their side. A Velcro strap was used to keep the feet stationary and together. The DXA examinations were administered by certified radiology technologists. Further details of the DXA examination protocol are documented in the Body Composition Procedures Manual located on the NHANES website.

Quality Assurance & Quality Control

A high level of quality control was maintained throughout the DXA data collection and scan analysis, including a rigorous phantom scanning schedule.

Monitoring of Field Staff and Densitometers
Staff from the National Center for Health Statistics (NCHS) and the NHANES data collection contractor monitored technologist acquisition performance through in-person observations in the field. Retraining sessions were conducted with the technologists annually and as needed to reinforce correct techniques and appropriate protocol. In addition, technologist performance codes were recorded by the NHANES quality control center at the University of California, San Francisco (UCSF), Department of Radiology as part of the participants’ scan review. The codes documented when the technologist had deviated from acquisition procedures and scan quality could have been improved. The performance codes were tracked for each technologist individually and a summary reported to NCHS on a quarterly basis. Constant communication was maintained throughout the year among the UCSF, the NCHS, and the data collection contractor regarding any issues that arose.

Hologic service engineers performed all routine densitometer maintenance and repairs. Copies of all reports completed by the manufacturer’s service engineers were sent to the UCSF when the scanners were serviced or repaired so any changes in measurement as a result of the work could be assessed. While some minor mechanical repairs were made during 2001-2002 survey operations, replacement or realignment of the detectors, apertures, or other major hardware was not required for any of the three densitometers.

Scan Analysis
Each participant scan was reviewed and analyzed by the UCSF using standard radiologic techniques and study-specific protocols developed for the NHANES. Hologic Discovery software, version 12.1, was used to analyze the scans. Expert review was conducted by the UCSF on 100% of analyzed participant scans to verify the accuracy and consistency of the results. Invalidity codes were applied by the UCSF to regions of the body that could not be analyzed accurately. The invalidity codes are provided in the data file (see Analytic Notes for a description of the invalidity codes).

The percentage of eligible survey participants in 2001-2002 with 100% valid data (no invalid regions) decreased with increasing age. The decrease in valid data with age was due primarily to an increase in the number of participants with implants such as pacemakers, stents, and hip replacements and higher rates of obesity resulting in excessive x-ray “noise” due to truncal adiposity, which interfered with the ability to obtain valid measurements. The percentage of participants with 100% valid data also decreased with increasing BMI due to truncal adiposity. For these reasons, as well as the exclusion of participants over 300 pounds from the DXA exam, users should be aware that the second day DXA data are not representative of all survey participants. Users should also be aware that regions of the body that may have been invalid in the primary exam may be valid in the second-day exam and vice versa. For example, jewelry may not have been removed or a positioning problem may have occurred in one scan and not the other.

Quality Control Scans
The quality control phantoms were scanned according to a predetermined schedule. The Hologic Anthropomorphic Spine Phantom associated with each MEC was scanned daily as required by the manufacturer to ensure accurate calibration of the densitometer. Other MEC-specific phantoms, such as the Hologic Whole Body Slim-line Phantom and Hologic Tissue Step Phantom, were scanned 1 to 3 times weekly. Another set of phantoms, the Hologic Spine (HSP-Q96), Hologic Block, and Hologic Whole Body Phantoms, circulated among the MECs and were scanned at the start of operations at each survey site.

Air scans, phantom-less scans using the whole body scan mode, were used to describe and monitor the systems’ radiographic uniformity across the entire scan field. The complete phantom scanning schedule is described in the Body Composition Procedures Manual located on the NHANES website.

The UCSF used the Cumulative Statistics method (CUSUM) and the MEC-specific phantom data to determine breaks in the calibration of the densitometers over the course of the survey (Lu). Multiplicative correction factors were used to correct the phantom data back to the baseline calibration. The type, frequency, and magnitude of calibration problems detected in the NHANES data were similar to those in other studies using stationary densitometers that were being monitored by UCSF. The correction factors were judged to be small and adjustment of the participant data not required.

Data Processing and Editing

The NHANES lean soft tissue mass and fat mass for the total body and regions were adjusted based on the results of an analysis of QDR- 4500A DXA data from seven research laboratories indicating that the QDR-4500A algorithm underestimated fat mass and overestimated lean mass (Schoeller). Based on criterion measurements of body composition from total body water by dilution, underwater weighing, and four-compartment analysis, the QDR-4500A was determined to overestimate lean mass (p < 0.05) in the cohort of 1198 subjects. The NHANES DXA lean mass was decreased by 5% and an equivalent kilogram weight added to the fat mass so the total mass did not change.

No other adjustments were made to the second day DXA data.

Analytic Notes

Because the second day sample was self-selected and nonrandom, no survey sample weights are associated with the second day DXA data. NCHS recommends that survey design variables such as sample weight not be linked with the second exam data, since these variables were created for use with the primary sample. The second day DXA data were intended to be used only for quality control and research purposes such as assessing intra-individual variability.

The second day exam data can be linked to the primary exam data and household interview data using the unique participant identifier (SEQN). Caution should be used in the analysis of the second day exam data. Analyses should include an investigation of the potential selection bias of the second day exam sample and evaluation of differences in characteristics such as age, gender, and race/ethnicity between the first and second day exam samples.

Because the second day exam data were not multiply imputed, the numbers and types of variables included in the second day exam data file will differ from those in the data file for the first exam. The variable nomenclature also differs: the first exam variable names have an X or D in the third position, while the second day exam variables have a 2 in the third position. For example, DXXTOPF becomes DX2TOPF.

Invalidity Codes
Invalidity codes were applied only to completed and valid scans (DXAEXSTS=1). Codes 1-7 indicate the reasons regions could not be analyzed accurately.

Invalidity codes
DXADISP = entire scan
DXATOBCC = total bone mineral density
DXATOPFC = total percent body fat
DXASTBCC = subtotal (excludes head) bone mineral density
DXASTPFC = subtotal (excludes head) percent body fat
DXAHEBV = head bone
DXAHETV = head soft tissue
DXALABV = left arm bone
DXALATV = left arm soft tissue
DXALLBV = left leg bone
DXALLTV = left leg soft tissue
DXARABV = right arm bone
DXARATV = right arm soft tissue
DXARLBV = right leg bone
DXARLTV = right leg soft tissue
DXATRBV = trunk bone, includes invalid thoracic or lumbar spine, left or right ribs, or pelvis
DXATRTV = trunk soft tissue

Values for invalidity codes
1 = Jewelry and other objects not removed
2 = Non-removable objects (includes prostheses, implants, casts)
3 = Excessive x-ray “noise” due to truncal adiposity, i.e., the DXA
      beam could not penetrate the layers of abdominal fat to provide an
      analyzable scan image (applied to the trunk region only)
4 = Arm/leg overlap
5 = Body parts out of scan region
6 = Positioning problem (head, arms/hands or feet turned)
7 = Other (includes participant motion, unknown artifacts, deformities)

References

Codebook and Frequencies

SEQN - Respondent sequence number

Variable Name:
SEQN
SAS Label:
Respondent sequence number
English Text:
Target:
Both males and females 8 YEARS - 150 YEARS

DX2EXSTS - Exam Status

Variable Name:
DX2EXSTS
SAS Label:
Exam Status
English Text:
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Scan completed 264 264
2 Scan completed, but invalid 1 265
. Missing 0 265

DX2TOBMC - Total Bone Mineral Content (g)

Variable Name:
DX2TOBMC
SAS Label:
Total Bone Mineral Content (g)
English Text:
Total Bone Mineral Content (grams)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1010.09 to 3645.28 Range of Values 234 234
. Missing 31 265

DX2TOBMD - Total Bone Mineral Density (g/cm^2)

Variable Name:
DX2TOBMD
SAS Label:
Total Bone Mineral Density (g/cm^2)
English Text:
Total Bone Mineral Density (grams/cm^2)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.736 to 1.441 Range of Values 234 234
. Missing 31 265

DX2TOFAT - Total Fat (g)

Variable Name:
DX2TOFAT
SAS Label:
Total Fat (g)
English Text:
Total Fat (grams)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
6316 to 63471.8 Range of Values 234 234
. Missing 31 265

DX2TOLE - Total Lean excl BMC (g)

Variable Name:
DX2TOLE
SAS Label:
Total Lean excl BMC (g)
English Text:
Total Lean excl Bone Mineral Content (grams)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
27794.2 to 92597.8 Range of Values 234 234
. Missing 31 265

DX2TOPF - Total Percent Fat

Variable Name:
DX2TOPF
SAS Label:
Total Percent Fat
English Text:
Total Percent Fat
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
11.5 to 51.8 Range of Values 234 234
. Missing 31 265

DX2TOA - Total Area (cm^2)

Variable Name:
DX2TOA
SAS Label:
Total Area (cm^2)
English Text:
Total Area (cm^2)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1372.56 to 2691.45 Range of Values 234 234
. Missing 31 265

DX2TOLI - Total Lean incl BMC (g)

Variable Name:
DX2TOLI
SAS Label:
Total Lean incl BMC (g)
English Text:
Total Lean incl Bone Mineral Content (grams)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
29409.2 to 96243.1 Range of Values 234 234
. Missing 31 265

DX2TOTOT - Total Lean+Fat (g)

Variable Name:
DX2TOTOT
SAS Label:
Total Lean+Fat (g)
English Text:
Total Lean incl BMC and Fat (grams)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
40927.3 to 128083.7 Range of Values 234 234
. Missing 31 265

DX2HEA - Head Area (cm^2)

Variable Name:
DX2HEA
SAS Label:
Head Area (cm^2)
English Text:
Head Area (cm^2)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
174.43 to 279.94 Range of Values 264 264
. Missing 1 265

DX2HEBMC - Head Bone Mineral Content (g)

Variable Name:
DX2HEBMC
SAS Label:
Head Bone Mineral Content (g)
English Text:
Head Bone Mineral Content (grams)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
225.84 to 839.62 Range of Values 264 264
. Missing 1 265

DX2HEBMD - Head Bone Mineral Density (g/cm^2)

Variable Name:
DX2HEBMD
SAS Label:
Head Bone Mineral Density (g/cm^2)
English Text:
Head Bone Mineral Density (grams/cm^2)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1.208 to 3.293 Range of Values 264 264
. Missing 1 265

DX2HEFAT - Head Fat (g)

Variable Name:
DX2HEFAT
SAS Label:
Head Fat (g)
English Text:
Head Fat (grams)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
762.5 to 2032.6 Range of Values 264 264
. Missing 1 265

DX2HELI - Head Lean incl BMC (g)

Variable Name:
DX2HELI
SAS Label:
Head Lean incl BMC (g)
English Text:
Head Lean incl Bone Mineral Content (grams)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
2505.3 to 5834.7 Range of Values 264 264
. Missing 1 265

DX2HELE - Head Lean excl BMC (g)

Variable Name:
DX2HELE
SAS Label:
Head Lean excl BMC (g)
English Text:
Head Lean excl Bone Mineral Content (grams)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
2140.5 to 5161.2 Range of Values 264 264
. Missing 1 265

DX2HEPF - Head Percent Fat

Variable Name:
DX2HEPF
SAS Label:
Head Percent Fat
English Text:
Head Percent Fat
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
22.2 to 26.1 Range of Values 264 264
. Missing 1 265

DX2HETOT - Head Total (g)

Variable Name:
DX2HETOT
SAS Label:
Head Total (g)
English Text:
Head Total (grams)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
3267.8 to 7867.2 Range of Values 264 264
. Missing 1 265

DX2LSA - Lumbar Spine Area (cm^2)

Variable Name:
DX2LSA
SAS Label:
Lumbar Spine Area (cm^2)
English Text:
Lumbar Spine Area (cm^2)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
23.96 to 73.88 Range of Values 242 242
. Missing 23 265

DX2LSBMC - Lumbar Spine BMC (g)

Variable Name:
DX2LSBMC
SAS Label:
Lumbar Spine BMC (g)
English Text:
Lumbar Spine Bone Mineral Content (grams)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
12.96 to 113.14 Range of Values 242 242
. Missing 23 265

DX2LSBMD - Lumbar Spine BMD (g/cm^2)

Variable Name:
DX2LSBMD
SAS Label:
Lumbar Spine BMD (g/cm^2)
English Text:
Lumbar Spine Bone Mineral Density (grams/cm^2)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.541 to 1.785 Range of Values 242 242
. Missing 23 265

DX2LAA - Left Arm Area (cm^2)

Variable Name:
DX2LAA
SAS Label:
Left Arm Area (cm^2)
English Text:
Left Arm Area (cm^2)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
131.39 to 331.65 Range of Values 264 264
. Missing 1 265

DX2LABMC - Left Arm BMC (g)

Variable Name:
DX2LABMC
SAS Label:
Left Arm BMC (g)
English Text:
Left Arm Body Mineral Content (grams)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
69.68 to 323.87 Range of Values 264 264
. Missing 1 265

DX2LABMD - Left Arm BMD (g/cm^2)

Variable Name:
DX2LABMD
SAS Label:
Left Arm BMD (g/cm^2)
English Text:
Left Arm Body Mineral Density (grams/cm^2)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.518 to 1.056 Range of Values 264 264
. Missing 1 265

DX2LAFAT - Left Arm Fat (g)

Variable Name:
DX2LAFAT
SAS Label:
Left Arm Fat (g)
English Text:
Left Arm Fat (grams)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
399.7 to 5107.2 Range of Values 264 264
. Missing 1 265

DX2LALI - Left Arm Lean incl BMC (g)

Variable Name:
DX2LALI
SAS Label:
Left Arm Lean incl BMC (g)
English Text:
Left Arm Lean incl BMC (grams)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1250.5 to 6021 Range of Values 264 264
. Missing 1 265

DX2LALE - Left Arm Lean excl BMC (g)

Variable Name:
DX2LALE
SAS Label:
Left Arm Lean excl BMC (g)
English Text:
Left Arm Lean excl Body Mineral Content (grams)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1151.9 to 5743.7 Range of Values 264 264
. Missing 1 265

DX2LAPF - Left Arm Percent Fat

Variable Name:
DX2LAPF
SAS Label:
Left Arm Percent Fat
English Text:
Left Arm Percent Fat
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
11.2 to 61.7 Range of Values 264 264
. Missing 1 265

DX2LATOT - Left Arm Total (g)

Variable Name:
DX2LATOT
SAS Label:
Left Arm Total (g)
English Text:
Left Arm Total (grams)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1901.4 to 8590.4 Range of Values 264 264
. Missing 1 265

DX2LLA - Left Leg Area (cm^2)

Variable Name:
DX2LLA
SAS Label:
Left Leg Area (cm^2)
English Text:
Left Leg Area(cm^2)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
226.81 to 515.5 Range of Values 261 261
. Missing 4 265

DX2LLBMC - Left Leg BMC (g)

Variable Name:
DX2LLBMC
SAS Label:
Left Leg BMC (g)
English Text:
Left Leg Bone Mineral Content (grams)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
192.47 to 754.25 Range of Values 261 261
. Missing 4 265

DX2LLBMD - Left Leg BMD (g/cm^2)

Variable Name:
DX2LLBMD
SAS Label:
Left Leg BMD (g/cm^2)
English Text:
Left Leg Bone Mineral Density (grams/cm^2)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.811 to 1.597 Range of Values 261 261
. Missing 4 265

DX2LLFAT - Left Leg Fat (g)

Variable Name:
DX2LLFAT
SAS Label:
Left Leg Fat (g)
English Text:
Left Leg Fat (grams)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1042.9 to 10387.2 Range of Values 261 261
. Missing 4 265

DX2LLLI - Left Leg Lean incl BMC (g)

Variable Name:
DX2LLLI
SAS Label:
Left Leg Lean incl BMC (g)
English Text:
Left Leg Lean incl Bone Mineral Content (grams)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
4028.6 to 17702.7 Range of Values 261 261
. Missing 4 265

DX2LLLE - Left Leg Lean excl BMC (g)

Variable Name:
DX2LLLE
SAS Label:
Left Leg Lean excl BMC (g)
English Text:
Left Leg Lean excl Bone Mineral Content (grams)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
3795.7 to 16948.5 Range of Values 261 261
. Missing 4 265

DX2LLPF - Left Leg Percent Fat

Variable Name:
DX2LLPF
SAS Label:
Left Leg Percent Fat
English Text:
Left Leg Percent Fat
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
10.6 to 57.3 Range of Values 261 261
. Missing 4 265

DX2LLTOT - Left Leg Total (g)

Variable Name:
DX2LLTOT
SAS Label:
Left Leg Total (g)
English Text:
Left Leg Total (grams)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
6276.5 to 23226.1 Range of Values 261 261
. Missing 4 265

DX2LRA - Left Ribs Area (cm^2)

Variable Name:
DX2LRA
SAS Label:
Left Ribs Area (cm^2)
English Text:
Left Ribs Area(cm^2)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
71.3 to 181.3 Range of Values 242 242
. Missing 23 265

DX2LRBMC - Left Ribs BMC (g)

Variable Name:
DX2LRBMC
SAS Label:
Left Ribs BMC (g)
English Text:
Left Ribs Bone Mineral Content (grams)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
36.45 to 156.13 Range of Values 242 242
. Missing 23 265

DX2LRBMD - Left Ribs BMD (g/cm^2)

Variable Name:
DX2LRBMD
SAS Label:
Left Ribs BMD (g/cm^2)
English Text:
Left Ribs Bone Mineral Density (grams/cm^2)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.467 to 0.903 Range of Values 242 242
. Missing 23 265

DX2PEA - Pelvis Area (cm^2)

Variable Name:
DX2PEA
SAS Label:
Pelvis Area (cm^2)
English Text:
Pelvis Area (cm^2)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
78.27 to 307.78 Range of Values 242 242
. Missing 23 265

DX2PEBMC - Pelvis BMC (g)

Variable Name:
DX2PEBMC
SAS Label:
Pelvis BMC (g)
English Text:
Pelvis Bone Mineral Content (grams)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
64.43 to 492.75 Range of Values 242 242
. Missing 23 265

DX2PEBMD - Pelvis BMD (g/cm^2)

Variable Name:
DX2PEBMD
SAS Label:
Pelvis BMD (g/cm^2)
English Text:
Pelvis Bone Mineral Density (grams/cm^2)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.823 to 1.854 Range of Values 242 242
. Missing 23 265

DX2RAA - Right Arm Area (cm^2)

Variable Name:
DX2RAA
SAS Label:
Right Arm Area (cm^2)
English Text:
Right Arm Area (cm^2)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
138.17 to 317.08 Range of Values 261 261
. Missing 4 265

DX2RABMC - Right Arm BMC (g)

Variable Name:
DX2RABMC
SAS Label:
Right Arm BMC (g)
English Text:
Right Arm Bone Mineral Content (grams)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
71.3 to 315.55 Range of Values 261 261
. Missing 4 265

DX2RABMD - Right Arm BMD (g/cm^2)

Variable Name:
DX2RABMD
SAS Label:
Right Arm BMD (g/cm^2)
English Text:
Right Arm Bone Mineral Density (grams/cm^2)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.516 to 1.091 Range of Values 261 261
. Missing 4 265

DX2RAFAT - Right Arm Fat (g)

Variable Name:
DX2RAFAT
SAS Label:
Right Arm Fat (g)
English Text:
Right Arm Fat (grams)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
464.9 to 4810.1 Range of Values 261 261
. Missing 4 265

DX2RALI - Right Arm Lean incl BMC (g)

Variable Name:
DX2RALI
SAS Label:
Right Arm Lean incl BMC (g)
English Text:
Right Arm Lean incl Bone Mineral Content (grams)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1395.4 to 6148.9 Range of Values 261 261
. Missing 4 265

DX2RALE - Right Arm Lean excl BMC (g)

Variable Name:
DX2RALE
SAS Label:
Right Arm Lean excl BMC (g)
English Text:
Right Arm Lean excl Bone Mineral Content (grams)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1283.9 to 5860.9 Range of Values 261 261
. Missing 4 265

DX2RAPF - Right Arm Percent Fat

Variable Name:
DX2RAPF
SAS Label:
Right Arm Percent Fat
English Text:
Right Arm Percent Fat
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
11.4 to 59.9 Range of Values 261 261
. Missing 4 265

DX2RATOT - Right Arm Total (g)

Variable Name:
DX2RATOT
SAS Label:
Right Arm Total (g)
English Text:
Right Arm Total (grams)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
2110.9 to 8741.3 Range of Values 261 261
. Missing 4 265

DX2RLA - Right Leg Area (cm^2)

Variable Name:
DX2RLA
SAS Label:
Right Leg Area (cm^2)
English Text:
Right Leg Area (cm^2)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
230.83 to 506.38 Range of Values 260 260
. Missing 5 265

DX2RLBMC - Right Leg BMC (g)

Variable Name:
DX2RLBMC
SAS Label:
Right Leg BMC (g)
English Text:
Right Leg Bone Mineral Content (grams)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
200.07 to 830.01 Range of Values 260 260
. Missing 5 265

DX2RLBMD - Right Leg BMD(g/cm^2)

Variable Name:
DX2RLBMD
SAS Label:
Right Leg BMD(g/cm^2)
English Text:
Right Leg Bone Mineral Density (grams/cm^2)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.818 to 1.804 Range of Values 260 260
. Missing 5 265

DX2RLFAT - Right Leg Fat (g)

Variable Name:
DX2RLFAT
SAS Label:
Right Leg Fat (g)
English Text:
Right Leg Fat (grams)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1039.3 to 10561.7 Range of Values 260 260
. Missing 5 265

DX2RLLI - Right Leg Lean incl BMC (g)

Variable Name:
DX2RLLI
SAS Label:
Right Leg Lean incl BMC (g)
English Text:
Right Leg Lean incl Bone Mineral Content (grams)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
4444.4 to 18256.7 Range of Values 260 260
. Missing 5 265

DX2RLLE - Right Leg Lean excl BMC (g)

Variable Name:
DX2RLLE
SAS Label:
Right Leg Lean excl BMC (g)
English Text:
Right Leg Lean excl Bone Mineral Content (grams)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
4165.1 to 17426.7 Range of Values 260 260
. Missing 5 265

DX2RLPF - Right Leg Percent Fat

Variable Name:
DX2RLPF
SAS Label:
Right Leg Percent Fat
English Text:
Right Leg Percent Fat
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
12.2 to 57.9 Range of Values 260 260
. Missing 5 265

DX2RLTOT - Right Leg Total (g)

Variable Name:
DX2RLTOT
SAS Label:
Right Leg Total (g)
English Text:
Right Leg Total (grams)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
7074.7 to 24161.4 Range of Values 260 260
. Missing 5 265

DX2RRA - Right Ribs Area (cm^2)

Variable Name:
DX2RRA
SAS Label:
Right Ribs Area (cm^2)
English Text:
Right Ribs Area (cm^2)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
67.68 to 201.83 Range of Values 242 242
. Missing 23 265

DX2RRBMC - Right Ribs BMC (g)

Variable Name:
DX2RRBMC
SAS Label:
Right Ribs BMC (g)
English Text:
Right Ribs Bone Mineral Content (grams)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
36.42 to 145.91 Range of Values 242 242
. Missing 23 265

DX2RRBMD - Right Ribs BMD (g/cm^2)

Variable Name:
DX2RRBMD
SAS Label:
Right Ribs BMD (g/cm^2)
English Text:
Right Ribs Bone Mineral Density (grams/cm^2)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.466 to 0.944 Range of Values 242 242
. Missing 23 265

DX2TSA - Thoracic Spine Area (cm^2)

Variable Name:
DX2TSA
SAS Label:
Thoracic Spine Area (cm^2)
English Text:
Thoracic Spine Area (cm^2)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
97.09 to 227.21 Range of Values 242 242
. Missing 23 265

DX2TSBMC - Thoracic Spine BMC (g)

Variable Name:
DX2TSBMC
SAS Label:
Thoracic Spine BMC (g)
English Text:
Thoracic Spine Bone Mineral Content (grams)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
55.55 to 241.71 Range of Values 242 242
. Missing 23 265

DX2TSBMD - Thoracic Spine BMD (g/cm^2)

Variable Name:
DX2TSBMD
SAS Label:
Thoracic Spine BMD (g/cm^2)
English Text:
Thoracic Spine Bone Mineral Density (grams/cm^2)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.563 to 1.25 Range of Values 242 242
. Missing 23 265

DX2TRBMC - Trunk BMC (g)

Variable Name:
DX2TRBMC
SAS Label:
Trunk BMC (g)
English Text:
Trunk Bone Mineral Content (grams)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
250.73 to 1051.24 Range of Values 242 242
. Missing 23 265

DX2TRA - Trunk Bone area (cm^2)

Variable Name:
DX2TRA
SAS Label:
Trunk Bone area (cm^2)
English Text:
Trunk Bone area (cm^2)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
443.68 to 870.56 Range of Values 242 242
. Missing 23 265

DX2TRBMD - Trunk Bone BMD (g/cm^2)

Variable Name:
DX2TRBMD
SAS Label:
Trunk Bone BMD (g/cm^2)
English Text:
Trunk Bone BMD (g/cm^2)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.565 to 1.292 Range of Values 242 242
. Missing 23 265

DX2TRFAT - Trunk Fat (g)

Variable Name:
DX2TRFAT
SAS Label:
Trunk Fat (g)
English Text:
Trunk Fat (grams)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
2208.5 to 32638.3 Range of Values 242 242
. Missing 23 265

DX2TRLI - Trunk Lean incl BMC (g)

Variable Name:
DX2TRLI
SAS Label:
Trunk Lean incl BMC (g)
English Text:
Trunk Lean incl Bone Mineral Content (grams)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
14920.4 to 43737.3 Range of Values 242 242
. Missing 23 265

DX2TRLE - Trunk Lean excl BMC (g)

Variable Name:
DX2TRLE
SAS Label:
Trunk Lean excl BMC (g)
English Text:
Trunk Lean excl Bone Mineral Content (grams)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
14471.5 to 42724.3 Range of Values 242 242
. Missing 23 265

DX2TRPF - Trunk Percent Fat

Variable Name:
DX2TRPF
SAS Label:
Trunk Percent Fat
English Text:
Trunk Percent Fat
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
9.4 to 54.1 Range of Values 242 242
. Missing 23 265

DX2TRTOT - Trunk Total (g)

Variable Name:
DX2TRTOT
SAS Label:
Trunk Total (g)
English Text:
Trunk Total (grams)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
19061 to 60320.2 Range of Values 242 242
. Missing 23 265

DX2STA - Subtotal Area (cm^2)

Variable Name:
DX2STA
SAS Label:
Subtotal Area (cm^2)
English Text:
Subtotal Area (cm^2)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1185.67 to 2450.14 Range of Values 234 234
. Missing 31 265

DX2STBMC - Subtotal BMC (g)

Variable Name:
DX2STBMC
SAS Label:
Subtotal BMC (g)
English Text:
Subtotal Bone Mineral Content (grams)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
784.25 to 3184.29 Range of Values 234 234
. Missing 31 265

DX2STBMD - Subtotal BMD (g/cm^2)

Variable Name:
DX2STBMD
SAS Label:
Subtotal BMD (g/cm^2)
English Text:
Subtotal Bone Mineral Density (grams/cm^2)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.661 to 1.323 Range of Values 234 234
. Missing 31 265

DX2STFAT - Subtotal Fat (g)

Variable Name:
DX2STFAT
SAS Label:
Subtotal Fat (g)
English Text:
Subtotal Fat (grams)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
5306.2 to 62033.3 Range of Values 234 234
. Missing 31 265

DX2STLI - Subtotal Lean incl BMC (g)

Variable Name:
DX2STLI
SAS Label:
Subtotal Lean incl BMC (g)
English Text:
Subtotal Lean incl Bone Mineral Content (grams)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
26678.8 to 91609.9 Range of Values 234 234
. Missing 31 265

DX2STLE - Subtotal Lean excl BMC (g)

Variable Name:
DX2STLE
SAS Label:
Subtotal Lean excl BMC (g)
English Text:
Subtotal Lean excl Bone Mineral Content (grams)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
25498.6 to 88425.7 Range of Values 234 234
. Missing 31 265

DX2STPF - Subtotal Percent Fat

Variable Name:
DX2STPF
SAS Label:
Subtotal Percent Fat
English Text:
Subtotal Percent Fat
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
10.5 to 53.2 Range of Values 234 234
. Missing 31 265

DX2STTOT - Subtotal (Total excl Head) (g)

Variable Name:
DX2STTOT
SAS Label:
Subtotal (Total excl Head) (g)
English Text:
Subtotal (Total excl Head) (grams)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
37604.5 to 121965.3 Range of Values 234 234
. Missing 31 265

DX2TOBCC - Total Bone Mineral Density Validity Code

Variable Name:
DX2TOBCC
SAS Label:
Total Bone Mineral Density Validity Code
English Text:
Total Bone Mineral Density Validity Code
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 Valid data 234 234
1 Invalid data 30 264
. Missing 1 265

DX2TOPFC - Total Percent Fat Validity Code

Variable Name:
DX2TOPFC
SAS Label:
Total Percent Fat Validity Code
English Text:
Total Percent Fat Validity Code
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 Valid data 234 234
1 Invalid data 30 264
. Missing 1 265

DX2HEBV - Head Bone Invalidity Code

Variable Name:
DX2HEBV
SAS Label:
Head Bone Invalidity Code
English Text:
Head Bone Invalidity Code
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 Valid data 264 264
1 Jewelry or other objects not removed 0 264
2 Non-removable objects 0 264
5 Body parts out of scan region 0 264
7 Other 0 264
. Missing 1 265

DX2LABV - Left Arm Bone Invalidity Code

Variable Name:
DX2LABV
SAS Label:
Left Arm Bone Invalidity Code
English Text:
Left Arm Bone Invalidity Code
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 Valid data 264 264
1 Jewelry or other objects removed 0 264
2 Non-removable objects 0 264
4 Arm/leg overlap 0 264
5 Body parts out of scan region 0 264
6 Positioning problem 0 264
7 Other 0 264
. Missing 1 265

DX2LATV - Left Arm Tissue Invalidity Code

Variable Name:
DX2LATV
SAS Label:
Left Arm Tissue Invalidity Code
English Text:
Left Arm Tissue Invalidity Code
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 Valid data 264 264
1 Jewelry or other objects not removed 0 264
2 Non-removable objects 0 264
4 Arm/leg overlap 0 264
5 Body parts out of scan region 0 264
6 Positioning problem 0 264
7 Other 0 264
. Missing 1 265

DX2LLBV - Left Leg Bone Invalidity Code

Variable Name:
DX2LLBV
SAS Label:
Left Leg Bone Invalidity Code
English Text:
Left Leg Bone Invalidity Code
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 Valid data 261 261
1 Jewelry or other objects not removed 0 261
2 Non-removable objects 3 264
4 Arm/leg overlap 0 264
5 Body parts out of scan region 0 264
6 Positioning problem 0 264
7 Other 0 264
. Missing 1 265

DX2LLTV - Left Leg Tissue Invalidity Code

Variable Name:
DX2LLTV
SAS Label:
Left Leg Tissue Invalidity Code
English Text:
Left Leg Tissue Invalidity Code
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 Valid data 261 261
1 Jewelry or other objects not removed 0 261
2 Non-removable objects 3 264
4 Arm/leg overlap 0 264
5 Body parts out of scan region 0 264
6 Positioning problem 0 264
7 Other 0 264
. Missing 1 265

DX2RABV - Right Arm Bone Invalidity Code

Variable Name:
DX2RABV
SAS Label:
Right Arm Bone Invalidity Code
English Text:
Right Arm Bone Invalidity Code
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 Valid data 261 261
1 Jewelry or other objects not removed 1 262
2 Non-removable objects 2 264
4 Arm/leg overlap 0 264
5 Body parts out of scan region 0 264
6 Positioning problem 0 264
7 Other 0 264
. Missing 1 265

DX2RATV - Right Arm Tissue Invalidity Code

Variable Name:
DX2RATV
SAS Label:
Right Arm Tissue Invalidity Code
English Text:
Right Arm Tissue Invalidity Code
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 Valid data 261 261
1 Jewelry or other objects not removed 1 262
2 Non-removable objects 2 264
4 Arm/leg overlap 0 264
5 Body parts out of scan region 0 264
6 Positioning problem 0 264
7 Other 0 264
. Missing 1 265

DX2RLBV - Right Leg Bone Invalidity Code

Variable Name:
DX2RLBV
SAS Label:
Right Leg Bone Invalidity Code
English Text:
Right Leg Bone Invalidity Code
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 Valid data 260 260
1 Jewelry or other objects not removed 0 260
2 Non-removable objects 4 264
4 Arm/leg overlap 0 264
5 Body parts out of scan region 0 264
6 Positioning problem 0 264
7 Other 0 264
. Missing 1 265

DX2RLTV - Right Leg Tissue Invalidity Code

Variable Name:
DX2RLTV
SAS Label:
Right Leg Tissue Invalidity Code
English Text:
Right Leg Tissue Invalidity Code
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 Valid data 260 260
1 Jewelry or other objects not removed 0 260
2 Non-removable objects 4 264
4 Arm/leg overlap 0 264
5 Body parts out of scan region 0 264
6 Positioning problem 0 264
7 Other 0 264
. Missing 1 265

DX2TRBV - Trunk Bone Invalidity Code

Variable Name:
DX2TRBV
SAS Label:
Trunk Bone Invalidity Code
English Text:
Trunk Bone Invalidity Code
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 Valid data 242 242
1 Jewelry or other objects not removed 1 243
2 Non-removable objects 2 245
3 Excessive X-ray noise 19 264
4 Arm/leg overlap 0 264
5 Body parts out of scan region 0 264
6 Positioning problem 0 264
7 Other 0 264
. Missing 1 265

DX2TRTV - Trunk Tissue Invalidity Code

Variable Name:
DX2TRTV
SAS Label:
Trunk Tissue Invalidity Code
English Text:
Trunk Tissue Invalidity Code
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 Valid data 242 242
1 Jewelry or other objects not removed 1 243
2 Non-removable objects 2 245
3 Excessive X-ray noise 19 264
4 Arm/leg overlap 0 264
5 Body parts out of scan region 0 264
6 Positioning problem 0 264
7 Other 0 264
. Missing 1 265

DX2HETV - Head Tissue Invalidity Code

Variable Name:
DX2HETV
SAS Label:
Head Tissue Invalidity Code
English Text:
Head Tissue Invalidity Code
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 Valid data 264 264
1 Jewelry or other objects not removed 0 264
2 Non-removable objects 0 264
5 Body parts out of scan region 0 264
7 Other 0 264
. Missing 1 265

DX2STPFC - Subtotal Percent Fat Validity Code

Variable Name:
DX2STPFC
SAS Label:
Subtotal Percent Fat Validity Code
English Text:
Subtotal Percent Fat Validity Code
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 Valid data 234 234
1 Invalid data 30 264
. Missing 1 265

DX2STBCC - Subtotal Bone Validity Code

Variable Name:
DX2STBCC
SAS Label:
Subtotal Bone Validity Code
English Text:
Subtotal Bone Validity Code
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 Valid data 234 234
1 Invalid data 30 264
. Missing 1 265

DX2DAY - Days between primary and second exams

Variable Name:
DX2DAY
SAS Label:
Days between primary and second exams
English Text:
Number of days between the primary and the second day exams.
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
7 to 51 Range of Values 264 264
. Missing 1 265

DX2TECH - Techs for primary and second exams

Variable Name:
DX2TECH
SAS Label:
Techs for primary and second exams
English Text:
Technicians for the primary and the second day exams.
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Same 231 231
2 Different 33 264
. Missing 1 265