Factors associated with program effectiveness in the implementation of a sexual risk reduction intervention for female sex workers across Mexico: Results from a randomized trial.

Results We found lower HIV/STI incidence density in the intervention relative to the control group in 5 sites we labeled as “program effective sites,” but not in 8 sites we labeled as “program ineffective sites.” Using generalized estimating equations controlling for site and computed mean difference effect sizes, we examined statistically and practically significant differences, respectively, between the two groups of sites along various client-, provider-, organization-, and structure-related characteristics.

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