If the assumed baseline level of mCPR is close to the actual one, power is expected to increase further as the investigators will (1) use a matched stratification on baseline levels of contraception prevalence rate at the radio station level (the level of treatment assignment), in addition to stratifying village selection on distance to health clinics, and individual selection of women on several characteristics such as education and access to a radio (2) control for baseline levels of explanatory variables and the baseline level of the outcome, and (3) use a panel structure.