Table 5.

Assumed prevalence for primary outcomes for calculations of sample size

Outcome measure	Control group prevalence
Adverse pregnancy outcomes: composite of any of the five conditions below, accounting for coexistence of conditions in 10% of women	0.145
1. Moderate or severe anemia at admission for labor	0.0225
2. Large-for-gestational age baby at delivery	0.054
3. Small-for-gestational age baby at delivery undetected during pregnancy	0.057
4. Malpresentation at delivery undetected during pregnancy	0.02
5. Severe hypertension at admission for labor	0.01
Process (adherence) outcomes	0.40–0.60