Trends in unprotected intercourse among heterosexual men before and after brothel ban in Siem Reap, Cambodia: a serial cross-sectional study (2003-2012).

All independent variables with p < 0.1 in the univariate analyses were further considered for entry into the multivariable regression model thus avoiding the exclusion of variables that may be marginally significant at selection but become statistically significant in the final adjusted analysis.

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