Data for these analyses were obtained from the NHANES I and
NHEFS. In NHANES I, information was collected from a national
probability sample of the civilian noninstitutionalized population
aged 1 to 74 years from 1971 through 1975. The survey consisted of
a standardized medical examination and questionnaires on various
topics (20–22), such as general medical history, 24-hour dietary
intake recall, and a food frequency interview. Additional data were
gathered from the detailed sample of adults aged 25 to 74 years (N 5
6913). These subjects provided supplemental information about
their medical history and healthcare needs, completed a general
well-being questionnaire, and underwent a more detailed medical
examination. The baseline cohort for the NHEFS consisted of the
14,407 persons aged 25 to 74 years who completed the physical
examinations in the cross-sectional NHANES I survey (70% of the
original cross-sectional sample). Follow-up surveys were conducted
from 1982 through 1984, in 1986 (for those aged 55 years and older
at baseline), and in 1987 and 1992 (23–26). Of the original NHEFS
sample, only 5% were lost to follow-up at all four follow-up surveys.
The analysis presented here included individuals who were 25 to
74 years old at baseline and who underwent the detailed medical
examination (N 5 6913). Only white and black persons were included
because of the small numbers of persons of other races. Of the
6833 individuals eligible for study, 358 were unavailable for follow-
up at all four periods, 116 had a history of stroke at baseline, and
264 had unknown values for one or more variables assessed in the
study. Thus, after all exclusions, 6095 persons were available for
analysis.
Data for these analyses were obtained from the NHANES I andNHEFS. In NHANES I, information was collected from a nationalprobability sample of the civilian noninstitutionalized populationaged 1 to 74 years from 1971 through 1975. The survey consisted ofa standardized medical examination and questionnaires on varioustopics (20–22), such as general medical history, 24-hour dietaryintake recall, and a food frequency interview. Additional data weregathered from the detailed sample of adults aged 25 to 74 years (N 56913). These subjects provided supplemental information abouttheir medical history and healthcare needs, completed a generalwell-being questionnaire, and underwent a more detailed medicalexamination. The baseline cohort for the NHEFS consisted of the14,407 persons aged 25 to 74 years who completed the physicalexaminations in the cross-sectional NHANES I survey (70% of theoriginal cross-sectional sample). Follow-up surveys were conductedfrom 1982 through 1984, in 1986 (for those aged 55 years and olderat baseline), and in 1987 and 1992 (23–26). Of the original NHEFSsample, only 5% were lost to follow-up at all four follow-up surveys.The analysis presented here included individuals who were 25 to74 years old at baseline and who underwent the detailed medicalexamination (N 5 6913). Only white and black persons were includedbecause of the small numbers of persons of other races. Of the6833 individuals eligible for study, 358 were unavailable for follow-
up at all four periods, 116 had a history of stroke at baseline, and
264 had unknown values for one or more variables assessed in the
study. Thus, after all exclusions, 6095 persons were available for
analysis.
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