Vietnam Population and AIDS Indicator Survey 2005 ... - Measure DHS
Vietnam Population and AIDS Indicator Survey 2005 ... - Measure DHS
Vietnam Population and AIDS Indicator Survey 2005 ... - Measure DHS
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• to obtain accurate information on behavioral indicators related to HIV/<strong>AIDS</strong> <strong>and</strong> other<br />
sexually transmitted infections.<br />
• to obtain accurate information on HIV/<strong>AIDS</strong> program indicators.<br />
• to obtain accurate estimates of the magnitude <strong>and</strong> variation in HIV prevalence in Hai Phong<br />
Province.<br />
1.4 SAMPLE SIZE AND DESIGN<br />
The sampling frame for the <strong>2005</strong> <strong>Vietnam</strong> <strong>Population</strong> <strong>and</strong> <strong>AIDS</strong> <strong>Indicator</strong> <strong>Survey</strong> (VPAIS) was<br />
the master sample used by the General Statistical Office (GSO) for its annual <strong>Population</strong> Change <strong>Survey</strong><br />
(PCS <strong>2005</strong>). The master sample itself was constructed in 2004 from the 1999 <strong>Population</strong> <strong>and</strong> Housing<br />
Census. As was true for the VN<strong>DHS</strong> 1997 <strong>and</strong> the VN<strong>DHS</strong> 2002 the VPAIS <strong>2005</strong> is a nationally<br />
representative sample of the entire population of <strong>Vietnam</strong>.<br />
The survey utilized a two-stage sample design. In the first stage, 251 clusters were selected from<br />
the master sample. In the second stage, a fixed number of households were systematically selected within<br />
each cluster, 22 households in urban areas <strong>and</strong> 28 in rural areas.<br />
The total sample of 251 clusters is comprised of 97 urban <strong>and</strong> 154 rural clusters. HIV/<strong>AIDS</strong><br />
programs have focused efforts in the four provinces of Hai Phong, Ha Noi, Quang Ninh <strong>and</strong> Ho Chi<br />
Minh City; therefore, it was determined that the sample should be selected to allow for representative<br />
estimates of these four provinces in addition to the national estimates. The selected clusters were allocated<br />
as follows: 35 clusters in Hai Phong province where blood samples were collected to estimate HIV<br />
prevalence; 22 clusters in each of the other three targeted provinces of Ha Noi, Quang Ninh <strong>and</strong> Ho Chi<br />
Minh City; <strong>and</strong> the remaining 150 clusters from the other 60 provinces throughout the country.<br />
Prior to the VPAIS fieldwork, GSO conducted a listing operation in each of the selected clusters.<br />
All households residing in the sample points were systematically listed by teams of enumerators, using<br />
listing forms specially designed for this activity, <strong>and</strong> also drew sketch maps of each cluster. A total of<br />
6,446 households were selected. The VPAIS collected data representative of:<br />
• the entire country, at the national level<br />
• for urban <strong>and</strong> rural areas<br />
• for three regions (North, Central <strong>and</strong> South), see Appendix for classification of regions.<br />
• for four target provinces: Ha Noi, Hai Phong, Quang Ninh <strong>and</strong> Ho Chi Minh City.<br />
All women <strong>and</strong> men aged 15-49 years who were either permanent residents of the sampled<br />
households or visitors present in the household during the night before the survey were eligible to be<br />
interviewed in the survey. All women <strong>and</strong> men in the sample points of Hai Phong who were interviewed<br />
were asked to voluntarily give a blood sample for HIV testing. For youths aged 15-17, blood samples<br />
were drawn only after first obtaining consent from their parents or guardians.<br />
1.5 QUESTIONNAIRE<br />
Two questionnaires were used in the survey, the Household Questionnaire <strong>and</strong> the Individual<br />
Questionnaire for women <strong>and</strong> men aged 15-49. The content of these questionnaires was based on the<br />
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