Table of Contents

Locator Record

Title: Body Measurements (BMX_C )
Contact Number: 1-866-441-NCHS
Years of Content: 2003 - 2004
First Published: November, 2005
Revised: NA
Access Constraints: None
Use Constraints: None
Geographic Coverage: National
Subject:Body Measures
Record Source: NHANES 2003 - 2004
Survey Methodology: NHANES 2003 - 2004 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

NHANES body measures data are used to:

The target age groups for the NHANES 2003–04 body measurement assessments are as follows:

Body weight: All ages
Recumbent length: 0–47 months
Standing height: 2+ years
Upper leg length: 8+ years
Upper arm length: 2+ months
Head circumference: 0–6 months
Mid-upper arm circumference: 2+ months
Waist circumference: 2+ years
Mid-thigh circumference: 8+ years
Maximal calf circumference: 8+ years
Triceps skin fold: 2+ months
Sub scapular skin fold: 2+ months

Eligible Sample

All survey participants are eligible for the body measurement component. There were no medical, safety, or other exclusions for the body measurements protocol. For persons who used a wheelchair, the health technicians used their discretion to obtain as many measures as practical. No changes have been made to the NHANES body measurement protocol since the continuous NHANES began in 1999.

Protocol and Procedure

The body measurement assessments performed on survey participants varied according to the age of the survey participant. The body measurement protocol used age at the time of the screening interview. In some instances, several weeks elapsed between the initial screening interview and the health examination visit. The Demographics Data File includes an age variable for age at examination (RIDAGEEX).

Arm and leg measurements were made on the right side of the body. If an examinee had an amputation, medical condition, or medical appliance such as a cast that prevented measurements from being taken on the right side of the body, the examiner took measurements on the left side. The body measurements file does not identify persons with amputations due to data disclosure concerns. Body weight data for individuals who had limb amputations were excluded from the release file. This data set includes body measurements for women who were pregnant at the time of the exam. Pregnancy status is denoted by the Demographic Data File variable, RIDEXPRG. RIDEXPRG denotes pregnancy status for 8–59 year old females at the time of the health examination. Please refer to the Demographics File documentation for important information about the pregnancy status recode variables that were included in the NHANES 1999-2000, NHANES 2001–2002, and NHANES 2003–2004 public data files.

For general guidelines on standard procedures that were followed for the anthropometric measures, please refer to the Anthropometric Standardization Reference Manual (Lohman, 1988). The body measurement techniques used in the survey are illustrated in the NHANES III Anthropometric Procedures Video. The video demonstrates the NHANES III anthropometric procedures in detail. The NHANES III video illustrates the proper technique for all of the measures taken in NHANES 2003–04 except the maximum calf circumference measurement. The video is available for purchase from the U.S. Government Printing Office.

For the procedures relevant to this component, please refer to NHANES website to obtain the Survey Operations Manual, Consent Documents, and brochures.

Quality Assurance & Quality Control

The NHANES health technicians completed a 2-day training program to learn the body measurement protocol. The training included an overview of the component using the NHANES III anthropometry videotape, demonstration by an expert examiner, and supervised practice exercises with an expert examiner and practice subjects of different ages. Health technician performance in the field was monitored using direct observation, data reviews, and expert examiner evaluations. The mobile examination centers (MECs) provided a standardized environment for the collection of high quality data. As part of their required duties, the health technicians verified body measurement instrument calibration in the field; a schedule for performing the equipment calibration checks is monitored. Data entry errors were reduced through the use of automated data entry methods. Please refer to the Body Measures Component Manual for a detailed description of the quality assurance and control measures used in NHANES.

Data Processing and Editing

Data were reviewed for unusual and erroneous values. The initial checks used range criteria that were based on the NHANES III or NHANES 1999–2002 body measures data. Range checks for infants under 2 months of age were based on NHANES 1999–2002 because the NHANES III dataset does not include infants less than 2 months of age. The range checks for persons 2 months of age and older were based on NHANES III. During the data review, values that were above the 99th percentile or below the 1st percentile for a particular age or age-gender group were flagged for review. When records were flagged, the entire body measurements record was reviewed for reasonableness subject characteristics such as height, weight, age and gender were taken into consideration. Values that were unrealistic were deleted from this file. Unusual, but plausible values were flagged. The variable list includes the flag variables. Analysts may wish to review the flagged records to determine if they should be included in their analysis. No body measures data were changed and there are no imputed values in this file.

Analytic Notes

Component status code: NCHS added a final body measures component status code (BMDSTAT) to the NHANES 2003–2004 file to provide analysts with a quick method of determining complete and partial body measures examination records.

Flag Variables: The flag variables in this file denote unusual values were noted during data review. Typically, unusual values occurred when a subject was extremely short, tall, overweight or underweight. Analysts may wish to review the flagged values prior to analyzing the data.

Comment Codes: Comment codes were noted by the health technicians during data collection. The comment codes were added to document problems or situations that prevented a measurement from being taken altogether or situations that could modify the results reported. For example, the variable BMIWT is a body weight comment code. If a subject did not change into the exam gown and wore their own clothing instead, a code of BMIWT of ‘3’ denoting ‘clothing worn’ was made. Analysts should review the comment code information prior to analyzing the data.

Sample Weights: The examination sample weights should be used to analyze the body measurement data. Please refer to the NHANES Analytic Guidelines document for guidance on the use of the sample weights.

References

Codebook and Frequencies

SEQN - Respondent sequence number

Variable Name:
SEQN
SAS Label:
Respondent sequence number
English Text:
Respondent sequence number.
Target:
Both males and females 0 YEARS - 150 YEARS

BMDSTATS - Body Measures Component Status Code

Variable Name:
BMDSTATS
SAS Label:
Body Measures Component Status Code
English Text:
Body Measures Component status Code
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Complete data for age group 7766 7766
2 Partial: Height and weight obtained 207 7973
3 Other partial exam 1573 9546
4 No body measures exam data 97 9643
. Missing 0 9643

BMDRECUF - Height-Length difference flagged

Variable Name:
BMDRECUF
SAS Label:
Height-Length difference flagged
English Text:
The difference between BMXRECUM and BMXHT for children 24-47 months is > 2.5cm.
Target:
Both males and females 0 MONTHS - 47 MONTHS
Code or Value Value Description Count Cumulative Skip to Item
1 Difference between recumbent length and standing height was greater than 2.5 cm 27 27
. Missing 9616 9643

BMDSUBF - Unusual value noted during data review

Variable Name:
BMDSUBF
SAS Label:
Unusual value noted during data review
English Text:
Unusual value noted during data review of BMXSUB
Target:
Both males and females 2 MONTHS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Unusual value noted during data review 1 1
. Missing 9642 9643

BMDTHICF - Unusual value noted during data review

Variable Name:
BMDTHICF
SAS Label:
Unusual value noted during data review
English Text:
Unusual value noted during data review of BMXTHICM
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Unusual value noted during data review 3 3
. Missing 9640 9643

BMDLEGF - Unusual value noted during data review

Variable Name:
BMDLEGF
SAS Label:
Unusual value noted during data review
English Text:
Unusual value noted during data review of BMXLEG
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Unusual value noted during data review 14 14
. Missing 9629 9643

BMDARMLF - Unusual value noted during data review

Variable Name:
BMDARMLF
SAS Label:
Unusual value noted during data review
English Text:
Unusual value noted during data review of BMXARML
Target:
Both males and females 2 MONTHS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Unusual value noted during data review 5 5
. Missing 9638 9643

BMDCALFF - Unusual value noted during data review

Variable Name:
BMDCALFF
SAS Label:
Unusual value noted during data review
English Text:
Unusual value noted during data review of BMXCALF
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Unusual value noted during data review 3 3
. Missing 9640 9643

BMXWT - Weight (kg)

Variable Name:
BMXWT
SAS Label:
Weight (kg)
English Text:
Weight (kg)
Target:
Both males and females 0 YEARS - 150 YEARS
Hard Edits:
0.0000 to 440.0000
Code or Value Value Description Count Cumulative Skip to Item
2.4 to 209.1 Range of Values 9529 9529
. Missing 114 9643

BMIWT - Weight Comment

Variable Name:
BMIWT
SAS Label:
Weight Comment
English Text:
Weight Comment
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Could not obtain 24 24
2 Exceeds capacity 0 24
3 Clothing 338 362
4 Medical appliance 17 379
. Missing 9264 9643

BMXRECUM - Recumbent Length (cm)

Variable Name:
BMXRECUM
SAS Label:
Recumbent Length (cm)
English Text:
Recumbent Length (cm)
Target:
Both males and females 0 MONTHS - 47 MONTHS
Hard Edits:
16.0000 to 119.3000
Code or Value Value Description Count Cumulative Skip to Item
44.3 to 111.2 Range of Values 1230 1230
. Missing 8413 9643

BMIRECUM - Recumbent Length Comment

Variable Name:
BMIRECUM
SAS Label:
Recumbent Length Comment
English Text:
Recumbent Length Comment
Target:
Both males and females 0 MONTHS - 47 MONTHS
Code or Value Value Description Count Cumulative Skip to Item
1 Could not obtain 38 38
2 Exceeds capacity 0 38
3 Not straight 0 38
. Missing 9605 9643

BMXHEAD - Head Circumference (cm)

Variable Name:
BMXHEAD
SAS Label:
Head Circumference (cm)
English Text:
Head Circumference (cm)
Target:
Both males and females 0 MONTHS - 6 MONTHS
Hard Edits:
00.0000 to 99.9999
Code or Value Value Description Count Cumulative Skip to Item
32.3 to 47.8 Range of Values 269 269
. Missing 9374 9643

BMIHEAD - Head Circumference Comment

Variable Name:
BMIHEAD
SAS Label:
Head Circumference Comment
English Text:
Head Circumference Comment
Target:
Both males and females 0 MONTHS - 6 MONTHS
Code or Value Value Description Count Cumulative Skip to Item
1 Could not obtain 1 1
2 Exceeds capacity 0 1
3 Not straight 0 1
. Missing 9642 9643

BMXHT - Standing Height (cm)

Variable Name:
BMXHT
SAS Label:
Standing Height (cm)
English Text:
Standing Height (cm)
Target:
Both males and females 2 YEARS - 150 YEARS
Hard Edits:
79.0000 to 208.4000
Code or Value Value Description Count Cumulative Skip to Item
79.7 to 204.4 Range of Values 8690 8690
. Missing 953 9643

BMIHT - Standing Height Comment

Variable Name:
BMIHT
SAS Label:
Standing Height Comment
English Text:
Standing Height Comment
Target:
Both males and females 2 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Could not obtain 62 62
2 Exceeds capacity 0 62
3 Not straight 201 263
. Missing 9380 9643

BMXBMI - Body Mass Index (kg/m**2)

Variable Name:
BMXBMI
SAS Label:
Body Mass Index (kg/m**2)
English Text:
Body Mass Index (kg/m**2)
Target:
Both males and females 2 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
12.4 to 64.97 Range of Values 8687 8687
. Missing 956 9643

BMXLEG - Upper Leg Length (cm)

Variable Name:
BMXLEG
SAS Label:
Upper Leg Length (cm)
English Text:
Upper Leg Length (cm)
Target:
Both males and females 8 YEARS - 150 YEARS
Hard Edits:
0.0000 to 200.0000
Code or Value Value Description Count Cumulative Skip to Item
24.7 to 54 Range of Values 7219 7219
. Missing 2424 9643

BMILEG - Upper Leg Length Comment

Variable Name:
BMILEG
SAS Label:
Upper Leg Length Comment
English Text:
Upper Leg Length Comment
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Could not obtain 322 322
. Missing 9321 9643

BMXCALF - Maximal Calf Circumference (cm)

Variable Name:
BMXCALF
SAS Label:
Maximal Calf Circumference (cm)
English Text:
Maximal Calf Circumference (cm)
Target:
Both males and females 8 YEARS - 150 YEARS
Hard Edits:
0.0000 to 200.0000
Code or Value Value Description Count Cumulative Skip to Item
17.5 to 70.5 Range of Values 7270 7270
. Missing 2373 9643

BMICALF - Maximal Calf Comment

Variable Name:
BMICALF
SAS Label:
Maximal Calf Comment
English Text:
Maximal Calf Comment
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Could not obtain 273 273
. Missing 9370 9643

BMXARML - Upper Arm Length (cm)

Variable Name:
BMXARML
SAS Label:
Upper Arm Length (cm)
English Text:
Upper Arm Length (cm)
Target:
Both males and females 2 MONTHS - 150 YEARS
Hard Edits:
0.0000 to 200.0000
Code or Value Value Description Count Cumulative Skip to Item
9 to 48 Range of Values 9190 9190
. Missing 453 9643

BMIARML - Upper Arm Length Comment

Variable Name:
BMIARML
SAS Label:
Upper Arm Length Comment
English Text:
Upper Arm Length Comment
Target:
Both males and females 2 MONTHS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Could not obtain 249 249
. Missing 9394 9643

BMXARMC - Arm Circumference (cm)

Variable Name:
BMXARMC
SAS Label:
Arm Circumference (cm)
English Text:
Arm Circumference (cm)
Target:
Both males and females 2 MONTHS - 150 YEARS
Hard Edits:
0.0000 to 200.0000
Code or Value Value Description Count Cumulative Skip to Item
10.8 to 58.8 Range of Values 9187 9187
. Missing 456 9643

BMIARMC - Arm Circumference Comment

Variable Name:
BMIARMC
SAS Label:
Arm Circumference Comment
English Text:
Arm Circumference Comment
Target:
Both males and females 2 MONTHS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Could not obtain 251 251
. Missing 9392 9643

BMXWAIST - Waist Circumference (cm)

Variable Name:
BMXWAIST
SAS Label:
Waist Circumference (cm)
English Text:
Waist Circumference (cm)
Target:
Both males and females 2 YEARS - 150 YEARS
Hard Edits:
0.0000 to 200.0000
Code or Value Value Description Count Cumulative Skip to Item
32 to 170.7 Range of Values 8397 8397
. Missing 1246 9643

BMIWAIST - Waist Circumference Comment

Variable Name:
BMIWAIST
SAS Label:
Waist Circumference Comment
English Text:
Waist Circumference Comment
Target:
Both males and females 2 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Could not obtain 319 319
. Missing 9324 9643

BMXTHICR - Thigh Circumference (cm)

Variable Name:
BMXTHICR
SAS Label:
Thigh Circumference (cm)
English Text:
Thigh Circumference (cm)
Target:
Both males and females 8 YEARS - 150 YEARS
Hard Edits:
0.0000 to 200.0000
Code or Value Value Description Count Cumulative Skip to Item
28 to 94.8 Range of Values 7194 7194
. Missing 2449 9643

BMITHICR - Thigh Circumference Comment

Variable Name:
BMITHICR
SAS Label:
Thigh Circumference Comment
English Text:
Thigh Circumference Comment
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Could not obtain 338 338
. Missing 9305 9643

BMXTRI - Triceps Skinfold (mm)

Variable Name:
BMXTRI
SAS Label:
Triceps Skinfold (mm)
English Text:
Triceps Skinfold (mm)
Target:
Both males and females 2 MONTHS - 150 YEARS
Hard Edits:
0.0000 to 45.0000
Code or Value Value Description Count Cumulative Skip to Item
2.8 to 44.6 Range of Values 8586 8586
. Missing 1057 9643

BMITRI - Triceps Skinfold Comment

Variable Name:
BMITRI
SAS Label:
Triceps Skinfold Comment
English Text:
Triceps Skinfold Comment
Target:
Both males and females 2 MONTHS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Could not obtain 548 548
2 Exceeds capacity 302 850
3 Hard to obtain 0 850
. Missing 8793 9643

BMXSUB - Subscapular Skinfold (mm)

Variable Name:
BMXSUB
SAS Label:
Subscapular Skinfold (mm)
English Text:
Subscapular Skinfold (mm)
Target:
Both males and females 2 MONTHS - 150 YEARS
Hard Edits:
0.0000 to 45.0000
Code or Value Value Description Count Cumulative Skip to Item
3 to 41.9 Range of Values 8065 8065
. Missing 1578 9643

BMISUB - Subscapular Skinfold Comment

Variable Name:
BMISUB
SAS Label:
Subscapular Skinfold Comment
English Text:
Subscapular Skinfold Comment
Target:
Both males and females 2 MONTHS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Could not obtain 1283 1283
2 Exceeds capacity 90 1373
3 Hard to obtain 0 1373
. Missing 8270 9643