Characteristics of studies examining STI prevalence among heterosexual male clients of female sex workers in China (N = 37).

NOTE: STI = sexually transmitted infection; IQR = interquartile range; VCT = voluntary counseling and testing; SD = standard deviation; FSW = female sex worker.
*Males detained at reeducation centers or jails for purchasing sex, or men arrested and sent by the public security bureau for STI testing.
**Among the total sample.