The Ministry of Health has conducted estimation for several times, namely in 2002 , 2004, 2006 and most recently in 2009. Report of Size Estimates HIV of Key Population in 2012 is a renewal of the report of Size Estimation of Most at Risk Population in 2009 issued by the Ministry of Health in year of 2010. This report describes a comprehensive situation and can understand in relation to the size of key affected population up to district/ city level.

The data used were obtained from various agencies, including the Ministry of Health, Ministry of Law and Human Rights, Central Bureau of Statistics, the Police, the National AIDS Control, the Regional AIDS Control Commission, Health Offices, Social Services, Tourism Offices, NGOs, and Network Organization, as well as the results of Integrated Biological and Behavioral Survey ( IBBS ), Village Potential Survey (PODES), and HIV Sero Surveillance.