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Table 2 Sample size estimations based on background incidence, case/comparator ratio and anticipated relative risk including continuity correction

From: Protocol for a drugs exposure pregnancy registry for implementation in resource-limited settings

  1 case / 1 comparator 1 case / 4 comparators
  RR to be detected : 2 RR to be detected : 10 RR to be detected : 2 RR to be detected : 10
Incidence in comparator group Cases Comparators Cases Comparators Cases Comparators Cases Comparators
5% 474 474 19 19 274 1096 10 40
1% 2515 2515 121 121 1445 5780 61 244
0.1% 25471 25471 1272 1272 14621 58484 628 2512