Prospective Cohort Study (Click or press Enter to follow animation)

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Presentation transcript:

Prospective Cohort Study (Click or press Enter to follow animation) Begin enquiry here & work forwards Outcomes Disease (a) Some have the factor (c) Sample people without the disease No Disease Population Disease (b) Some do not (d) No Disease (lapse of time) Statistic = Relative Risk [RR] = (a/c) divided by (b/d) This shows the ratio of incidence in exposed compared to non-exposed. RR > 1 implies a hazard; RR < 1 implies a protective factor 95% CI are usually presented: e.g., RR = 1.9 (95% CI 1.5, 2.3) Note: as you begin with people who do not have the disease, you can calculate incidence but not prevalence. (Prevalence would be underestimated as you omitted existing cases)