Table 1.

Description of variables and data sources.

Variable	Description	Data source
Age	Age in years at time of ANCa registration	Medical record or ANC registration book
Parity (including current pregnancy)	Total number of pregnancies, including current pregnancy	Medical record
Distance from home village to registration clinic (km)	Distance from home village to the clinic where the woman registered for ANC in kilometers (km)	Home village recorded from medical record or ANC registration book, then distance from the registration clinic in km was estimated using Google Maps
Married/in partnership	Marital status recorded as married or stable union	Medical record
Employed and/or partner employed	Occupation of the pregnant woman and/or husband/partner was recorded, then categorized as being at home or outside the home. If 1+ person worked outside the home, they were categorized as employed	Medical record
Gestation at registration (weeks)	Number of weeks pregnant at the time of registration for ANC	Medical record or ANC registration book
Number of follow-up antenatal visits attended	Number of visits attended after the first registration visit; dates of subsequent visits were recorded, then counted	Medical record or ANC registration book
Intervention group	Enrolled in the intervention group if women were pregnant, over 18 years of age, presented to an intervention clinic for ANC registration, and agreed to participate	Sign-up sheet or registration book from midwives in clinic

^aANC: antenatal care.