Assessment of the NIOSH Head-and-Face Anthropometric Survey of U.S. Respirator Users (2007) / Chapter Skim
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3 The NIOSH-Sponsored Anthrotech Study's Sampling Strategy
3 The NIOSH-Sponsored Anthrotech Study's Sampling Strategy
Pages 43-52
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From page 43... ...
THE ANTHROTECH SAMPLING PLAN The goal of the NIOSH-sponsored Anthrotech study was to survey a group of individuals reflecting the racial, ethnic, age, and gender diversity of the respirator wearing workforce in the United States. The sampling plan used in the study (Appendix C)
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From page 44... ...
. To ensure that the sample adequately captured the variation of measurements within each of the racial groups, Anthrotech oversampled the African American, Hispanic, and "Other" groups -- that is, the sample included a larger percentage of these minorities than is found in the general population.
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From page 45... ...
The report provides no further details on either the criteria Anthrotech used to select the various establishments, response rate from these establishments, or any comparison of participating versus nonparticipating sites. This committee found that the 41 worksites listed in the final report were more often larger establishments.
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From page 46... ...
This is difficult to determine as the number and size of incentives is not reported. However, monetary incentives are well-known to create biases in survey data, partly because these monetary incentives appeal more to some kinds of potential participants than others and partly by increasing bias in responses.
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From page 47... ...
. Additionally, many immigrants tend to concentrate in distinct areas of the United States (e.g., Asian immigrants in California, and Hmong and Somali immigrants in Minnesota)
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From page 48... ...
. LIMITATIONS OF THE SAMPLE POPULATION Overall the committee found limited analysis in the NIOSHsponsored Anthrotech study comparing the categorized subgroups, so it is not known whether age, race, and gender affect specific measurements, composite measure, or ultimately the overall utility of anthro
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From page 49... ...
If survey data are to serve as a sound foundation for conclusions, both the sample and the analysis of the sample must meet certain criteria. These include • precise definition of the target population (the population to be covered by inferences from the data)
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From page 50... ...
Defining the Target Population A clear definition of the target population is critical to survey design, which was not done in the NIOSH-sponsored Anthrotech study. The survey intends to reflect "respirator users," but that term is ambiguous: Does "respirator user" mean workers who typically use respirators?
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From page 51... ...
Recommendation 3-1: Define Target Populations More Precisely. Future anthropometric face panel studies undertaken by, or on behalf of, NIOSH should have a statistically rigorous and valid sampling plan and implementa tion strategy that precisely define the target popula tion and also ensure that the samples of selected subjects included in the studies are representative of the predefined sample population (e.g., the current workforce that wears respirators, workers who should be using respirators, the general United States workforce)
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From page 52... ...
2001. Anthropometric survey of respirator users: Study protocol.
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