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Table 2 Power scenarios for the obstetric outcome

From: Trial protocol OPPTIMUM– Does progesterone prophylaxis for the prevention of preterm labour improve outcome?

fFN+ fFN- Subjects (fFN+/ fFN-) [Total] Power
25% 8% 375/750 (1125) 81%
   400/800 (1200) 83%
   425/850 (1275) 86%