What makes large epidemiological studies comparable?
نویسندگان
چکیده
R epeated cross-sectional surveys have been largely used to assess temporal trends in the prevalence of diseases. To be reliable, these should respect the following simple, but essential, rules: 1) the same source population should be randomly sampled and studied on different occasions, using the same sampling frame; 2) similar numbers of subjects should be selected; 3) the disease should be diagnosed by using the same criteria and identical protocols; and 4) the data should be analysed by specific statistical techniques with appropriate adjustments of the differences in response rates.
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عنوان ژورنال:
- The European respiratory journal
دوره 36 4 شماره
صفحات -
تاریخ انتشار 2010