A nested case control study of venous thromboembolism is conducted within a large cohort of women using oral contraceptives. Each time a new thrombosis case occurs, controls are selected from women who are still at risk in the cohort at that same time point. Which sampling strategy is being used?
- A)Snowball sampling
- B)Incidence density samplingGABARITO
- C)Ecologic sampling
- D)Simple random sampling from the full cohort at baseline
- E)Convenience sampling
Explicação
Incidence density sampling selects controls from the risk set at the time each case occurs. This preserves the time structure of the underlying cohort and allows the odds ratio from the nested case control study to estimate the incidence rate ratio. It is a st... Ver explicação completa e trilha adaptativa →