Table 1. Model assumptions.

Model	Primary Assumption for pill dispensing	Levels of estimated delivery date**
Model A– 100% pill dispensing	All women who attend a clinic visit receive 28 days’ worth of pills at each documented visit except the last documented visit*	36 weeks
		38 weeks
		40 weeks
Model B– 90% pill dispensing	Assume 90% of women who attended a visit got 28 days’ worth of pills while the remaining 10% attended a visit but were not dispensed pills except for the last documented visit*.	36 weeks
		38 weeks
		40 weeks
Model C– 80% pill dispensing	Assume 80% of women who attended a visit got 28 days’ worth of pills while the remaining 20% attended a visit but were not dispensed pills except for the last documented visit*.	36 weeks
		38 weeks
		40 weeks

* All models—Last visit pill dispensing: Women with observed clinic visits up to delivery date or estimated delivery date are allocated 28 days’ worth of pills at the last visit according to the primary assumption for each model (100%, 90% or 80% dispensing). Women with > one month unobserved time prior to delivery date or estimated delivery date—assume 40% of these women remain in care during unobserved time ((they get sufficient pills up to known or estimated delivery date) while 60% get the allocated 28 days’ worth of pills dispensed at their last visit according to the model allocation (100%, 90% or 80% dispensing).

** Assumption applied to n = 34 women with unknown delivery date