Table 2.

Pregnancy probabilities for participants in both groups

	C31G (N=932)			Conceptrol (N=633)
Population	# pregnancies	Pregnancy probability (%)	95% CI	# pregnancies	Pregnancy probability (%)	95% CI	Diff	95% CI
6-month
ITT	88	11.4	8.8 – 14.1	60	11.6	8.4 – 14.9	−0.2	−4.4 – 3.9
MITT	85	12.0	9.3 – 14.7	57	12.0	8.7 – 15.3	0.0	−4.3– 4.3
CC	17	4.8	1.6 – 7.9	12	4.5	0.7 – 8.3	0.3	−4.7 – 5.2
12-month
MITT	91	13.8	7.6 – 20	68	19.8	10.9 – 28.7	−6.0	−16.9 – 4.9
CC	17	5.5	0.0 – 16.1	13	6.6	0.0 – 20.1	−1.0	−18.2 – 16.2

ITT = Intent-to-treat; MITT= Modified intent-to-treat; CC= Correct and consistent use (efficacy-evaluable)