NHANES I Epidemiologic Followup Study
The NHEFS cohort includes all persons 25-74 years of age who completed a medical examination at NHANES I in 1971-75 (n = 14,407). It is comprised of a series of follow-up studies, four of which have been conducted to date. The first wave of data collection was conducted for all members of the NHEFS cohort from 1982 through 1984. It included tracing the cohort; conducting personal interviews with subjects or their proxies; measuring pulse rate, weight, and blood pressure of surviving participants; collecting hospital and nursing home records of overnight stays; and collecting death certificates of decedents.
Continued follow-up of the NHEFS population was conducted in 1986, 1987, and 1992 using the same design and data collection procedures developed in the 1982-84 NHEFS, with the exception that a 30-minute computer-assisted telephone interview was administered rather than a personal interview; and no physical measurements were taken. The 1986 NHEFS was conducted for members of the NHEFS cohort who were 55-74 years of age at their baseline examination and not known to be deceased at the 1982-84 NHEFS (n = 3,980). The 1987 NHEFS was conducted for the entire nondeceased NHEFS cohort (n = 11,750). The fourth wave of data collection, the 1992 NHEFS, includes the entire nondeceased NHEFS cohort (n = 11,195). Tracing and data-collection rates in the NHEFS have been very high. Ninety-six percent of the study population has been successfully traced at some point through the 1992 follow-up. Tracing rates for each completed wave ranged from 90 to 94 percent and interview rates ranged from 91 to 96 percent of those traced.
and Tracing Status Data
Care Facility Stay Data
Additional mortality data can be found on the NHANES I Epidemiologic Follow-up Survey (NHEFS) linked mortality file, which extends the mortality follow-up period through December 31, 2000 and brings the total number of NHEFS decedents to 6,656. The NHEFS linked mortality file includes death information for all those previously identified as deceased during the NHANES I Epidemiologic Follow-up survey periods, as well as, deaths identified through a probabilistic match with the NCHS National Death Index (NDI). Due to confidentiality requirements, the NHEFS linked mortality file is only accessible through the NCHS Research Data Center (RDC).
and Operation of the NHANES 1 Epidemiologic Followup Study, 1992
and Operation of the NHANES 1 Epidemiologic Followup Study, 1987
and Operation of the NHANES 1 Epidemiologic Followup Study, 1986
and Operation of the NHANES 1 Epidemiologic Followup Study 1982-84
Issues in Analyzing the NHANES 1 Epidemiologic Followup Study
Christine S. Cox
Special Projects Branch
Office of Analysis,and Epidemiology
National Center for Health Statistics
Centers for Disease Control and Prevention
3311 Toledo Road, Room 6425
Hyattsville, Maryland 20782
This page last reviewed
October 15, 2008