Table 2

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

Mehta et al.

Mehta et al. BMC Pregnancy and Childbirth 2012 12:89   doi:10.1186/1471-2393-12-89

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