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If the answer is affirmative, contact information would be solicited so that people with the disease or condition can be followed up with a specialized questionnaire. For example, the U.S. National Survey of Family Growth (NSFG) was based on a sample of reproductive age women previously interviewed in the U.S. National Health Interview Survey ...
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The primary sampling units (PSUs) were schools, and the secondary sampling units (SSUs) were school classes. The odds for school selection were proportional to the school size (total number of ninth-year classes), while the classes in each school were chosen by simple random selection.
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