Table 5.

Life-table analysis presenting the number of women exposed to the risk of becoming pregnant by cycle, the number of cumulative pregnancies, the cumulative pregnancy probability and its 95% CI. The cumulative pregnancy probability is calculated on a cycle basis, where cycle 1 corresponds to the first cycle for which the ovulation day was detected and cycle 12 implies that the women were exposed to at least 11 full cycles after cycle 1. 60 out of 3993 women dropped out prior to detection of their first ovulation day and are therefore censored before cycle 1.

Ordinal cycle number	Women exposed	Cumulative pregnancies	Cumulative pregnancy probability (%)	CI, lower bound (%)	CI, upper bound (%)
1	3933	25	0.64	0.39	0.88
2	3656	44	1.15	0.81	1.49
3	3324	70	1.93	1.48	2.37
4	3020	87	2.48	1.96	2.99
5	2674	104	3.10	2.51	3.69
6	1981	115	3.64	2.97	4.30
7	1443	129	4.57	3.75	5.39
8	1058	134	5.02	4.11	5.93
9	798	139	5.62	4.57	6.66
10	601	141	5.93	4.81	7.06
11	389	142	6.17	4.95	7.39
12	138	143	6.85	5.06	8.65