Basic demographic, behavioral, and medical history data were collected from all NHEFS participants at the time of their NHANES I interview during 1971-1975.
The NHEFS follow-up interviews with the study participant or his/her proxy were conducted in-person in 1982-1984, and via the telephone in 1986 (only for persons age 55-74 at baseline), 1987, and 1992.
The NHEFS health care facility stay data contain information about study participants' overnight stays in a hospital and/or nursing home.
Our study follow-up ends with 2000; however, the NHEFS linked mortality file has recently been updated to provide mortality follow-up through December 31, 2006.
Of the 5,814 NHEFS participants born in 1935 or earlier and who were alive on January 1, 1991, 4,846 were linked to Medicare A and B records at some point between January 1, 1991 and December 31, 2000.
Table 1 presents the sociodemographic and health profile of the study participants with linked Medicare records compared with the original sample of NHEFS participants born in 1935 or earlier and with those participants who were not linked to Medicare records.
Informed consent was obtained from the study subjects, and the protocols for the NHANES I and NHEFS were approved by the appropriate institutional review boards.
The abstainer category was divided into lifetime versus previous-year abstainers (referred to as ex-drinkers) by integrating data from wave 1 of the NHEFS conducted in 1982-1984 (Cohen et al.
TABLE 1 Alcohol consumption at baseline and CHD incidence in African Americans--the NHEFS cohort Females N Incidence RR * 95% CI Lifetime 238 53 1 abstainer Ex-drinker 96 24 1.
Vital status from follow-up in NHEFS was not available on 186 persons (3.
The weights provided on the 1987 NHEFS public use tapes were used to adjust for survey oversampling and nonresponse to yield population estimates of reported baseline descriptors, but were not used in the survival analyses.