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Table 1 Descriptive statistics of selected country-level variables

From: Pattern and determinants of HIV research productivity in sub-Saharan Africa: bibliometric analysis of 1981 to 2009 PubMed papers

Indicator Year Median Range
HIV patients (× 1000) 2007 140.0 0.2, 5700.0
Gross domestic product (US dollar) 2007 646.0 115, 19552.0
Education    
   Adult literacy rate 2001-2005 67.2 23.6, 91.8
   Public expenditure on education* 2000 - 2007 17.4 4.0, 29.8
   Research and development researchers (× 1000)   5.0 0.0, 100
   Number of high institutions** 2009 3.0 0.0, 91.0
   Number of indexed journals 2009 1.0 0.0, 99.0
Health    
   Physicians per 100,000 population 2002-2005 554.0 81.0, 34923.0
   Total expenditure on health*** 2006 4.9 1.5, 12.3
   Private expenditure on health 2006 47.9 13.4, 87.7
  1. * Percentage of GDP
  2. ** Higher institutions - universities, colleges and polytechnics
  3. *** Percentage of total expenditure on health