They obtained information on demographic characteristics, in cluding age, sex, education, occupation, and household incom e. The interview included questions related to the diagnosis and treatment of hypertension and diabetes. Women were asked w hether diabetes had been diagnosed during pregnancy and wh ether it had been diagnosed when they were not pregnant.
Statistical methods The InterASIA study was designed to provide precise estimates of th e prevalence of the individual components of the metabolic syndrom e and the prevalence of the metabolic syndrome and overweight by s ex, area of residence (rural or urban), and region (northern or southe rn China) in four age groups: 35–44, 45–54, 55–64 and 65–74 years old. Sample sizes were estimated to meet generally recommended require ments for precision in a complex survey. Assuming a design effect of 1·5 (the ratio of the variance of a statisti c from a complex sample to the variance of the same statistic from a simple random sample of the same size) and a risk factor prevalence of 5%, it was estimated that a minimum of 240 study participants wo uld be needed for each final sample stratum. Correction for multiple outcomes was not done.
71 Summary In this chapter, the basic approaches to descriptive epidemiology are presented, with a focus on the patterns of occurrence of tuber culosis. Description in epidemiology begins with the assumption that dis eases do not occur at random. Typically, three standard questions are posed to characterize the nonrandom distribution of a disease : 1.Who gets the disease? 2.Where does the disease occur? 3.When does the disease occur? These questions concern the elements of person, place, and time, respectively
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