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Population-Based Health Surveys

National Health Interview Survey
The National Health Interview Survey (NHIS) is an ongoing national sample of approximately 50,000 households and 100,000 individuals from the resident civilian population. The main objective of the NHIS is to monitor the health of the United States population through the collection and analysis of data on a broad range of health topics. A major strength of this survey lies in the ability to display these health characteristics by many demographic and socioeconomic characteristics. The NHIS covers the civilian noninstitutionalized population of the United States living at the time of the interview.  The National Health Interview Survey is a cross-sectional household interview survey.

The Health and Retirement Survey (HRS) and the Asset and Health Dynamics of the Oldest Old (AHEAD)
The Health and Retirement Survey (HRS) (N=9,741 at baseline) and the Asset and Health Dynamics of the Oldest Old (AHEAD) (N=7,443 at baseline). The HRS began in 1992, surveying persons aged 51-61 years and their spouses. The AHEAD survey began in 1994, interviewing respondents aged 70 years and older and their spouses. Respondents from both data sets have been surveyed again approximately every two years. There are currently 4 waves of AHEAD and 5 of HRS. The data have a range of social, economic, and health information.

The Longitudinal Studies on Aging (LSOAs)
The Longitudinal Studies of Aging (LSOAs) is a collaborative project of National Center for Health Statistics (NCHS) and the National Institute on Aging (NIA). It is a multicohort study of persons 70 years of age and over designed primarily to measure changes in the health, functional status, living arrangements, and health services utilization of two cohorts of Americans as they move into and through the oldest ages. The project is comprised of four surveys:
the 1984 Supplement on Aging (SOA)
the 1984-1990 Longitudinal Study of Aging (LSOA)
the 1994 Second Supplement on Aging (SOA II)
the 1994-2000 Second Longitudinal Study of Aging (LSOA II)

The Nihon University Longitudinal Study on Aging (NUJLSOA)
The NUJLSOA is a longitudinal Survey of a nationally representative sample of the Japanese population age 65 and older begun in 1999. Interviews were conducted in November 1999 with additional respondents added in March 2000 when a follow-up of nonrespondents was completed. This resulted in a sample of 4,997 and a response rate of 75%. The final sample of 4,997 respondents ranged in age from 65 to 104 and was nearly 41% male, and had a mean age of 77years. The surveys included questions on topics such as functioning, chronic conditions and impairments, health behaviors, and social and demographic characteristics. The NUJLSOA was designed to be comparable to the U.S. Longitudinal Study on Aging II (LSOAII).