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Design of study: Randomised controlled trial in a stratifiedsample.
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Methods: A stratifiedsample of 184 patients with primary sclerosing cholangitis and age- and sex-matched institutional control subjects were identified.
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Objective: In 2016, data were collected and analyzed from a nationally representative stratifiedsample of 816 LHDs.
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Using this as our sampling frame, we conducted questionnaire surveys with a stratifiedsample of 1,924 household heads and 945 household heads' wives.
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Methods: A randomized and stratifiedsample of 47,979 students from state and private schools of the 27 Brazilian state capitals completed a self-report questionnaire.