Table 1.

Enrollment, pregnancy, and births by eligibility status at initial consent

	High non-tryer	High tryer	Total preconception	Pregnant	Total
Number of women consented	231	198	429	970	1399
Proportion of women consented in study	16.5 %	14.2 %	30.6 %	69.3 %	100.0 %
Number of pregnancies	54	111	165	970	1135
Proportion of women conceiving	23.4 %	56.1 %	38.5 %	100.0 %	81.1 %
Proportion of pregnancies in study	4.8 %	9.8 %	14.5 %	85.5 %	100.0 %
Number of women giving birth	44	98	142	780	922
Proportion of pregnant women with known birth	81.5 %	88.3 %	86.1 %	80.4 %	81.2 %
Proportion of births in study	4.8 %	10.6 %	15.4 %	84.6 %	100.0 %

Eligibility status at consent often differed from eligibility status at original screening because of a delay in implementing preconception enrollment. Of the 970 enrolled pregnant, 228 were not pregnant at initial screening. See Fig. 1 and reference #11