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. Author manuscript; available in PMC: 2023 Jan 3.
Published in final edited form as: Vaccine. 2021 Nov 29;40(1):76–88. doi: 10.1016/j.vaccine.2021.11.041

Table 3.

Proportion of households and potential participants identified by ACIB staff compared to the national census, for both the trial and survey, within the primary catchment area (districts = 202/472)

Census Trial Census (weighted)A EHS
Households 495,933 479,751 (96.7%) 100,019 96,755 (96.7%)
Girls 12–16 years of age 61,759 33,174 † (53.7%) 11,046 6,926 (62.7%)

MGUs, Minimal geo-statistical units; EHS, Epidemiologic HPV Survey

A

Whereas the raw census numbers were used to compute the proportion of households identified and potentially-eligible girls for the trial, we needed to weight census counts for the survey because, by design, we only approached a subset of the households and girls (roughly 20% because we needed about to enroll about 4000 survey participants compared to 20,000 trial participants (or ∼20%). Thus, the census (weighted) counts are the raw census numbers multiplied by the following weighting factor: number of survey houseolds identified divided by the number of trial households identified = 96,755/479,751 ≈ 1/4.96 or 20.2%. This adjustment to the census enables a more accurate denominator for the calculation proportion of households and potential participants identified for our study.

†

29,734 registered when they were 12–16 years old; 3,440 girls registered when they were 10–11 years.