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Objective:

To estimate the size of groups at high risk of HIV, Network Scale UP (NSU), an indirect method, was used.

Methods:

500 Kermanian male aged 18 to 45 were recruited. 8 groups at high risk of HIV were defined: Users of opium, unknown drug, ecstasy, and alcohol; intra-venous drug users (IDUs; males who have extra-marital sex with females (MSF); male who have sex with female sex workers (MFSW); and male who have sex with other male (MSMs). We asked respondents whether they know anybody (probability method), and if yes, how many people (frequency method) in our target groups.

Results:

Estimates derived in the probability method were higher than the frequency method. Based on the probability method, 13.7%(95% CI: 11.3%, 16.1%) of males used alcohol at least once in last year; the corresponding percent for opium was 13.1%(95% CI: 10.9%, 15.3%). In addition, 12% has extra-marital sex in …