No sample size calculation was done due to the exploratory nature. For the primary outcome, we performed an estimate of the precision. Given a precision of ± 3% and assumed proportion of 30% self-sampling (enrolled subjects), a sample size of 1200 WLWH estimates a 95% confidence interval completely within the required precision. In the pessimistic case with a given a precision of ± 2% and assumed proportion of only 10% self-sampling (enrolled subjects), a sample size of 1200 WLWH estimates a 95% confidence interval completely within the required precision.
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