What Effect Do Year of Survey, Sample Frame, and Survey Techniques Have on ADL Estimates?
Differences in ADL estimates may also derive from a combination of technical factors, although the effect of these factors is not clear in terms of direction and magnitude. These differences include the year the survey was conducted, sample frame, use of proxy respondents, and survey instrument design. One clear difference among surveys is in the year the interviews were conducted. Given the strong association between age and ADL status, a change in the age composition of the elderly population could result in different prevalence estimates.30 For example, between 1982 and 1987, the number of elderly aged 65-74 increased only 9.1 percent, while the number aged 75-84 increased 13.7 percent and the number aged 85 and older grew by 17.3 percent.31 Another possible explanation for varying estimates involves differences in sampling frame. To estimate elderly ADL status in the community, the 1982 and 1984 National Long-Term Care Surveys sampled individuals, not households, and only Medicare-
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- What Effect Do Year of Survey, Sample Frame, and Survey Techniques Have on ADL Estimates?
