"In August 2008, the BBC World Service Trust conducted a quantitative midline sentinel survey on HIV and AIDS Knowledge Attitudes and Practice (KAP) and media habits. The Trust has consistently applied a survey methodology using cross-sectional household-based surveys since 2004. The 2008 Sentinel Study total sample size is 1,368 young people aged 15-29 from six locations—Phnom Penh, Kandal, Kampong Speu, Kampong Chhnang, Battambang and Siem Reap. These provinces were selected for the sentinel surveys because they have the highest level of media consumers according to the CDHS 2005. Data was collected using face to face interviews in the Khmer language. Fieldwork was conducted in August 2008. The survey questionnaire, as in the 2007 Sentinel Study, covered a range of topics, of which this report includes: demographics; media practices; HIV and AIDS on radio and TV; exposure to the Trust’s HIV and AIDS outputs." (Executive summary, page 8)