Table 1. Categorization of values of the covariates.

Categories	Low	Medium	High
Operational districts population density (population/km2)	< 100	100–250	≥ 250
Distance to health care facility (% of women who perceived distance as a problem in accessing health care)	< 30	30–50	≥ 50
All basic vaccination coverage (% population vaccinated)	< 70	70–80	≥ 80
HIV prevalence (% adults 15–49 who have HIV)	< 0.3	0.3–0.7	? ≥ 0.7