Review of the Disability Evaluation Study Design Third Interim Report (1999) / Chapter Skim
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2 Overview of the Disability Evaluation Study
2 Overview of the Disability Evaluation Study
Pages 3-11
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and identifies the key survey design and sampling plan, data collection plans, and operational decisions made to date regarding the national survey and its pilot study.
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yield a sample of the venous subgroups of working-age people with severe enough disabilities to be likely to be eligible for disability benefits for SSA purposes if they applied; yield a sample of the "borderline" group of people with disabilities sufficient to per mit estimates of the number and characteristics of those who might become eligible, or cease to be eligible, if the current SSA disability decision criteria are altered; yield a sample of people with only mild or no disabilities sufficient to permit com pansons with the population with disabilities on measures of physical and functional performance and medical conditions in the population; and 4. yield a sample of people receiving disability benefits under SSD]
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Westat expects little loss in efficiency in employing different PSU definitions for the area and RDD samples. Measure of Size for Sampling PSUs in sampling units of unequal population sizes (counties, in this study)
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Sampling Methods Stratification Variables To ensure geographical spread and demographic diversity of the sampled PSUs, the PSU frame will be stratified by geographic region, metropolitan status, income level, minority status, prevalence of work disability using 1990 census data, and population size. In addition, because research on work disabilities has shown marked differences by geographic region, Westat is considering stratifying by prevalence of work disability to ensure annror~n~te renr~entntion of crew with very high and very low levels of disability.
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To obtain a self-weighting sample of households of sufficient size for the initial screening process, about 64,124 dwelling units in the area sample will be listed and canvassed to include 4,168 nontelephone households in the sample. In the area sample, each PSU will be divided into sampling units or segments, which are defined to be census blocks.
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Response Rates Westat's assumptions about the sample size that needs to be screened to obtain the required 5,665 persons distributed disproportionately in the four strata for the various components are based on achieving the following response rates: 90 percent for the initial screening interview; · 90 percent for the subsequent in-person interview and medical examination; and an overall response rate of 80 percent for the combined interview and medical examination components. Assuming that these high response rates can be achieved, Westat estimates that a sample of about 9S,095 persons in about 57,712 households will be sufficient to yield 5,665 persons for the DES study group.
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The pilot study will also test the effectiveness of the screening instruments and the accuracy of the screening algorithm; determine the best procedures for maximizing the response rates, both total and item; and develop estimates of prevalence rates to determine the final sample sizes for the main study. Finally, the pilot study will test the operational procedures for medical examinations, including the reliability of physician and nurse practitioner examinations; medical examinations performed in the home and in mobile MECs; and the logistics, reliability, and validity of the simulated disability decision process.
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Response rates will be a critical factor in determining the final sample sizes for the main study. To increase response rates, Westat plans to conduct four experiments with different data collection methods, four with refusal conversion incentive strategies, and one with medical providers.
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The resulting classification analysis will address the sensitivity and specificity of the screening process. Pretests and laboratory testing of the instruments prior to the pilot study, help concentrate on issues of item wording, response options, item sensitivity, sequencing, and flow.
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