DISCUSSION
In this study, the age group was categorized into four groups where majority of the male respondents were from the age group 24-29 whereas majority of the female respondents were from the age group 20-24.This finding is consistent with the study done on mapping and size estimation of most at risk-population in Nepal, 2011 [6] where majority of the IDUs were from the age group 20-29.
Majority of the female respondents were from Dharan (n=32%)) followed by Biratnagar (n=24%). This finding was consistent with the study done by UNODC [9] where majority of the IDUs were from Sunsari followed by Morang.