, Mohammad Esmaiel Motlagh *1
, Omid Massah
, Sara Sarmadi
, Rosa Alikhani
, Fardin Alipour
, Ameneh Pooresmaeil Dorosteh
Method: we applied a cross-sectional study among substance users between Jun 2022 and March 2023. Samples were recruited using snowball sampling and convenient sampling in 4 cities in Iran. Data collection was performed by trained interviewers. For data analysis coarsened exact matching (CEM) was applied to examine the causal association between CIs on injection and sexual risk behaviors.
Result : The result of final multivariable regression model reveled that substance abusers with CIs were more likely to have unprotected sex in three past month as compared to abusers without CIs status (OR: 2.3 95% CI: 1.4, 4.7).