From: Trial protocol OPPTIMUM– Does progesterone prophylaxis for the prevention of preterm labour improve outcome?
fFN+
fFN-
Subjects (fFN+/fFN-) [Total]
Power
40%
10%
375/750 (1125)
81%
400/800 (1200)
83%
425/850 (1275)
85%
45%
13%
88%
90%
92%
50%
15%
93%
94%
95%