National Health and Nutrition Examination Survey

1999-2000 Data Documentation, Codebook, and Frequencies

Blood Pressure (BPX)

Data File: BPX.xpt

First Published: June 2002

Last Revised: NA

Component Description

To support public health program in the control and prevention of CVD, heart rate is measured on all children 0-7 years of age; radial pulse is measured on examinees 8 years and older; and blood pressure (BP) is measured on all examinees 8 years and older.

Eligible Sample

There are no exclusion criteria.

Protocol and Procedure

Data Collection Methods

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.

Examination Protocol

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

Survey Staff

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 Quality Control Manual 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

Perloff. D. Grim. Carlene. G. Flack J. et al. Human blood pressure determination by sphygmomanometry. Circulation. 1993; 88:2460-2469

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 2 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative
1	Complete	8958	8958
2	Partial	38	8996
3	Not done	286	9282
.	Missing	0	9282

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 2 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0 to 4051	Range of Values	9282	9282
.	Missing	0	9282

PEASCCT1 - Blood Pressure Comment

Variable Name:: PEASCCT1
SAS Label:: Blood Pressure Comment
English Text:: Blood Pressure Comment
Target:: Both males and females 2 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative
0	None	8960	8960
1	Safety exclusion	3	8963
2	SP refusal	52	9015
3	No time	15	9030
4	Physical limitation	7	9037
5	Communication problem	4	9041
6	Equipment failure	1	9042
7	SP ill/emergency	9	9051
56	Came late/left early	174	9225
99	Other, specify	57	9282
.	Missing	0	9282

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
50 to 180	Range of Values	1744	1744
.	Missing	7538	9282

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
1	Yes	2022	2022
2	No	5238	7260
.	Missing	2022	9282

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
1	Yes	4	4
2	No	7256	7260
.	Missing	2022	9282

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
1	Yes	30	30
2	No	7230	7260
.	Missing	2022	9282

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
1	Yes	79	79
2	No	7181	7260
.	Missing	2022	9282

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
1	Right	7209	7209
2	Left	39	7248
8	Could not obtain	12	7260
.	Missing	2022	9282

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
1	Infant (6X12)	6	6
2	Child (9X17)	1374	1380
3	Adult (12X22)	3480	4860
4	Large (15X32)	2050	6910
5	Thigh (18X35)	334	7244
.	Missing	2038	9282

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
36 to 142	Range of Values	7253	7253
.	Missing	2029	9282

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 6	Range of Values	57	57
.	Missing	9225	9282

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
1	Regular	8736	8736
2	Irregular	267	9003
.	Missing	279	9282

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
1	Radial	7247	7247
2	Brachial	9	7256
8	Could not obtain	0	7256
.	Missing	2026	9282

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
100 to 260	Range of Values	7229	7229
888	Could not obtain	0	7229
.	Missing	2053	9282

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 242	Range of Values	6457	6457
.	Missing	2825	9282

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 132	Range of Values	6457	6457
.	Missing	2825	9282

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
1	Yes	2	2
2	No	7226	7228
8	Could not obtain	0	7228
.	Missing	2054	9282

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
72 to 226	Range of Values	6368	6368
.	Missing	2914	9282

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	6368	6368
.	Missing	2914	9282

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
1	Yes	75	75
2	No	7153	7228
8	Could not obtain	0	7228
.	Missing	2054	9282

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
74 to 232	Range of Values	6256	6256
.	Missing	3026	9282

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 120	Range of Values	6255	6255
.	Missing	3027	9282

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
1	Yes	100	100
2	No	7128	7228
8	Could not obtain	0	7228
.	Missing	2054	9282

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
72 to 234	Range of Values	1643	1643
.	Missing	7639	9282

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 136	Range of Values	1643	1643
.	Missing	7639	9282

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
1	Yes	52	52
2	No	2084	2136
8	Could not obtain	0	2136
.	Missing	7146	9282

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
73 to 233	Range of Values	7215	7215
.	Missing	2067	9282

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 132	Range of Values	7215	7215
.	Missing	2067	9282

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