Table of Contents

Locator Record

Title: Blood Pressure (BPX_B )
Contact Number: 1-866-441-NCHS
Years of Content: 2001 - 2002
First Published: May, 2004
Revised: NA
Access Constraints: None
Use Constraints: None
Geographic Coverage: National
Subject:Blood Pressure
Record Source: NHANES 2001 - 2002
Survey Methodology: NHANES 2001 - 2002 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

To support public health programs in the control and prevention of CVD, heart rate is measured on all children 0-4 years of age; radial pulse is measured on examinees 5 years and older; and blood pressure (BP) is measured on all examinees 8 years and over as part of the Physician’s Examination in the Mobile Examination Center. This documentation describes the blood pressure measurement data.

Eligible Sample

All persons 8 years and over. There are no exclusion criteria.

Protocol and Procedure

Three and sometimes 4 BP determinations (systolic and diastolic) are taken in the mobile examination center (MEC) and during home examinations on all eligible individuals using a mercury sphygmomanometer.

Participants who are 50 years and older or less than one year of age who are unable to travel to the MEC are offered an abbreviated examination in their homes. Blood pressure measurements are taken by one of the MEC examiners.

The technique used to obtain BP follows the latest recommendations of the American Heart Association Human Blood Pressure Determination by sphygmomanometers (Perloff, 1993).

Two physicians (MEC setting) and 2 health technologists (Home Examination setting) are trained to collect NHANES BP data using a standardized protocol.

Quality Assurance & Quality Control

The quality control procedure includes the following elements: initial extensive training; quarterly re-certification by an expert consultant during field visits; a quality assurance plan including a procedural checklist; and continuous review of the data for systematic error.

The first recertification for the blood pressure component was conducted six months after the start of NHANES 1999; quarterly recertification training has been conducted since that time.

Please refer to the NHANES Physician Examination Procedures Manual (National Center for Health Statistics, 2000) for more detailed information about the blood pressure protocol.

Data Processing and Editing

BP determinations are recorded directly onto a computerized data collection form. The system is centrally integrated and it allows for ongoing monitoring of the data.

Analytic Notes

The variables BPXSAR and BPXDAR represent blood pressure results that were reported to the examinee. They do not represent traditional averages. These variables were calculated using the following protocol:

If only one blood pressure reading was obtained, that reading is the average.

If there is more than one blood pressure reading, the first reading is always excluded from the average.

If only two blood pressure readings were obtained, the second blood pressure reading is the average.

If all diastolic readings were zero, then the average would be zero.

Exception: If there is one diastolic reading of zero and one (or more) with a number above zero, the diastolic reading with zero is not used to calculate the diastolic average. If two out of three diastolic readings are zero, the one diastolic reading that is not zero is used to calculate the diastolic average.

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

PEASCST1 - Blood Pressure Status

Variable Name:
PEASCST1
SAS Label:
Blood Pressure Status
English Text:
Blood Pressure Status
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Complete 10006 10006
2 Partial 60 10066
3 Not done 411 10477
. Missing 0 10477

PEASCTM1 - Blood Pressure Time in Seconds

Variable Name:
PEASCTM1
SAS Label:
Blood Pressure Time in Seconds
English Text:
Blood Pressure Time in Seconds
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 to 2268 Range of Values 10477 10477
. Missing 0 10477

PEASCCT1 - Blood Pressure Comment

Variable Name:
PEASCCT1
SAS Label:
Blood Pressure Comment
English Text:
Blood Pressure Comment
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 None 10006 10006
1 Safety exclusion 4 10010
2 SP refusal 75 10085
3 No time 11 10096
4 Physical limitation 25 10121
5 Communication problem 2 10123
6 Equipment failure 1 10124
7 SP ill/emergency 18 10142
56 Came late/left early 187 10329
99 Other, specify 148 10477
. Missing 0 10477

BPXCHR - 60 sec HR (30 sec HR * 2)

Variable Name:
BPXCHR
SAS Label:
60 sec HR (30 sec HR * 2)
English Text:
60 sec HR (30 sec HR * 2)
Target:
Both males and females 0 YEARS - 7 YEARS
Code or Value Value Description Count Cumulative Skip to Item
54 to 304 Range of Values 2169 2169
. Missing 8308 10477

BPQ150A - Had food in the past 30 minutes?

Variable Name:
BPQ150A
SAS Label:
Had food in the past 30 minutes?
English Text:
Have you had any of the following in the past 30 minutes?: Food
English Instructions:
Check each that applies
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Yes 3008 3008
2 No 4911 7919
. Missing 2558 10477

BPQ150B - Had alcohol in the past 30 minutes?

Variable Name:
BPQ150B
SAS Label:
Had alcohol in the past 30 minutes?
English Text:
Have you had any of the following in the past 30 minutes?: Alcohol
English Instructions:
Check each that applies
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Yes 2 2
2 No 7917 7919
. Missing 2558 10477

BPQ150C - Had coffee in the past 30 minutes?

Variable Name:
BPQ150C
SAS Label:
Had coffee in the past 30 minutes?
English Text:
Have you had any of the following in the past 30 minutes?: Coffee
English Instructions:
Check each that applies
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Yes 21 21
2 No 7898 7919
. Missing 2558 10477

BPQ150D - Had cigarettes in the past 30 minutes?

Variable Name:
BPQ150D
SAS Label:
Had cigarettes in the past 30 minutes?
English Text:
Have you had any of the following in the past 30 minutes?: Cigarettes
English Instructions:
Check each that applies
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Yes 62 62
2 No 7857 7919
. Missing 2558 10477

BPAARM - Arm selected:

Variable Name:
BPAARM
SAS Label:
Arm selected:
English Text:
Arm selected:
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Right 7868 7868
2 Left 23 7891
8 Could not obtain 29 7920
. Missing 2557 10477

BPACSZ - Coded cuff size

Variable Name:
BPACSZ
SAS Label:
Coded cuff size
English Text:
Cuff size (cm) (width X length)
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Infant (6X12) 2 2
2 Child (9X17) 494 496
3 Adult (12X22) 3051 3547
4 Large (15X32) 3548 7095
5 Thigh (18X35) 782 7877
. Missing 2600 10477

BPXPLS - 60 sec. pulse (30 sec. pulse * 2):

Variable Name:
BPXPLS
SAS Label:
60 sec. pulse (30 sec. pulse * 2):
English Text:
60 sec. pulse (30 sec. pulse * 2):
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
32 to 136 Range of Values 7897 7897
. Missing 2580 10477

BPXDB - # of dropped beats in 30 seconds

Variable Name:
BPXDB
SAS Label:
# of dropped beats in 30 seconds
English Text:
# of dropped beats in 30 seconds
Target:
Both males and females 12 YEARS - 49 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 to 15 Range of Values 66 66
. Missing 10411 10477

BPXPULS - Pulse regular or irregular?

Variable Name:
BPXPULS
SAS Label:
Pulse regular or irregular?
English Text:
Pulse regular or irregular?
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Regular 9814 9814
2 Irregular 270 10084
. Missing 393 10477

BPXPTY - Pulse type:

Variable Name:
BPXPTY
SAS Label:
Pulse type:
English Text:
Pulse type:
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Radial 7905 7905
2 Brachial 8 7913
8 Could not obtain 0 7913
. Missing 2564 10477

BPXML1 - MIL: maximum inflation levels (mm Hg)

Variable Name:
BPXML1
SAS Label:
MIL: maximum inflation levels (mm Hg)
English Text:
MIL: maximum inflation levels (mm Hg)
Target:
Both males and females 8 YEARS - 150 YEARS
Hard Edits:
70.0000 to 300.0000
Code or Value Value Description Count Cumulative Skip to Item
100 to 280 Range of Values 7859 7859
888 Could not obtain 0 7859
. Missing 2618 10477

BPXSY1 - Systolic: Blood pres (1st rdg) mm Hg

Variable Name:
BPXSY1
SAS Label:
Systolic: Blood pres (1st rdg) mm Hg
English Text:
Systolic: Blood pressure (first reading) mm Hg
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
74 to 266 Range of Values 7126 7126
. Missing 3351 10477

BPXDI1 - Diastolic: Blood pres (1st rdg) mm Hg

Variable Name:
BPXDI1
SAS Label:
Diastolic: Blood pres (1st rdg) mm Hg
English Text:
Diastolic: Blood pressure (first reading) mm Hg
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 to 134 Range of Values 7126 7126
. Missing 3351 10477

BPAEN1 - Enhancement used first reading

Variable Name:
BPAEN1
SAS Label:
Enhancement used first reading
English Text:
Enhancement used first reading
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Yes 1 1
2 No 7859 7860
8 Could not obtain 0 7860
. Missing 2617 10477

BPXSY2 - Systolic: Blood pres (2nd rdg) mm Hg

Variable Name:
BPXSY2
SAS Label:
Systolic: Blood pres (2nd rdg) mm Hg
English Text:
Systolic: Blood pressure (second reading) mm Hg
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
70 to 222 Range of Values 6897 6897
. Missing 3580 10477

BPXDI2 - Diastolic: Blood pres (2nd rdg) mm Hg

Variable Name:
BPXDI2
SAS Label:
Diastolic: Blood pres (2nd rdg) mm Hg
English Text:
Diastolic: Blood pressure (second reading) mm Hg
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 to 128 Range of Values 6897 6897
. Missing 3580 10477

BPAEN2 - Enhancement used second reading

Variable Name:
BPAEN2
SAS Label:
Enhancement used second reading
English Text:
Enhancement used second reading
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Yes 40 40
2 No 7820 7860
8 Could not obtain 0 7860
. Missing 2617 10477

BPXSY3 - Systolic: Blood pres (3rd rdg) mm Hg

Variable Name:
BPXSY3
SAS Label:
Systolic: Blood pres (3rd rdg) mm Hg
English Text:
Systolic: Blood pressure (third reading) mm Hg
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
72 to 218 Range of Values 6837 6837
. Missing 3640 10477

BPXDI3 - Diastolic: Blood pres (3rd rdg) mm Hg

Variable Name:
BPXDI3
SAS Label:
Diastolic: Blood pres (3rd rdg) mm Hg
English Text:
Diastolic: Blood pressure (third reading) mm Hg
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 to 126 Range of Values 6837 6837
. Missing 3640 10477

BPAEN3 - Enhancement used third reading

Variable Name:
BPAEN3
SAS Label:
Enhancement used third reading
English Text:
Enhancement used third reading
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Yes 79 79
2 No 7781 7860
8 Could not obtain 0 7860
. Missing 2617 10477

BPXSY4 - Systolic: Blood pres (4th rdg) mm Hg

Variable Name:
BPXSY4
SAS Label:
Systolic: Blood pres (4th rdg) mm Hg
English Text:
Systolic: Blood pressure (fourth reading if necessary) mm Hg
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
74 to 218 Range of Values 1573 1573
. Missing 8904 10477

BPXDI4 - Diastolic: Blood pres (4th rdg) mm Hg

Variable Name:
BPXDI4
SAS Label:
Diastolic: Blood pres (4th rdg) mm Hg
English Text:
Diastolic: Blood pressure (fourth reading if necessary) mm Hg
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 to 114 Range of Values 1573 1573
. Missing 8904 10477

BPAEN4 - Enhancement used fourth reading

Variable Name:
BPAEN4
SAS Label:
Enhancement used fourth reading
English Text:
Enhancement used fourth reading
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Yes 37 37
2 No 2118 2155
8 Could not obtain 0 2155
. Missing 8322 10477

BPXSAR - SBP average reported to examinee

Variable Name:
BPXSAR
SAS Label:
SBP average reported to examinee
English Text:
Systolic blood pressure average:
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
72 to 266 Range of Values 7837 7837
. Missing 2640 10477

BPXDAR - DBP average reported to examinee

Variable Name:
BPXDAR
SAS Label:
DBP average reported to examinee
English Text:
Diastolic blood pressure average:
Target:
Both males and females 8 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 to 127 Range of Values 7837 7837
. Missing 2640 10477