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Researchers examined data from the U.S. Department of Agriculture Continuing Survey of Food Intakes by Individuals, a nationally representative multistage sample of 16,103 people containing information about dietary intake, socioeconomic, demographic and health parameters surveyed from 1994 to 1996.
In brief, a cross-sectional survey was conducted in a representative multistage sample of 889 reproductive-age men and women refugees from 48 camps served by RHG.
We analyzed smokers' responses to hypothetical future price increases according to sociodemographic characteristics and smoking conditions in a multistage sample of Brazilian current cigarette smokers aged ≥14 years (n = 500).
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Multistage sampling of cases was done.
Respondents were selected by stratified multistage sampling of the non-institutionalised population residing in Spain.
For example, the DHS uses cluster-sampling to draw upon women respondents via multistage sampling of enumeration areas.
In the Philippines, El Salvador and Peru, a multistage sampling of clusters of public and private schools within each country was performed.
We therefore used a purposive multistage sampling of first selection of districts based on poverty incidence (PI) followed by selection of communities within the districts.
Following NHANES analytic guidelines (CDC 2006a), we used SAS procedures that accurately incorporate the stratification and multistage sampling of NHANES: Proc Survey Means Proc SurveyReg, and Proc SurveyFreq (SAS Institute Inc).
To address the peculiarity of the multistage complex survey design of NHANES-III, final analyses were performed using SUDAAN (RTI International, Research Triangle Park, NC), software that accounts for the multistage sampling of NHANES-III in computing variance estimates.
This sample size was based on the assumption that the prevalence of CMD would be about 10%, with a design effect of 1.5 (due to the multistage sampling of study participants), a precision of 0.02 and a 15% non-response.
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