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Points to consider Study design Study population Case definition

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Presentation on theme: "Points to consider Study design Study population Case definition"— Presentation transcript:

1 Points to consider Study design Study population Case definition
Confounders Exposure definition and ascertainment Study size

2 Possible designs Cohort study in general population
Cohort study of groups selected by exposure Case-control study based on hospital admissions Cross-sectional survey of occupations selected by exposure

3 Case definition and ascertainment
Questionnaire about symptoms and past treatment Physician diagnosis based on physical examination Doppler studies Hospital diagnosis

4 Exposure definition and ascertainment
Based on duration of standing without walking Based on duration of standing/walking Assessed by questionnaire By goniometry By observation By inference from job title

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