Change in efficiency of national HIV/AIDS programs in the period of 2002-2007. Source: Authors' analysis of data compiled from 68 developing countries from 2002 to 2007. Notes: The efficiency was evaluated by the pooled DEA. Each point represents the mean efficiency in the year(s). Due to the small sample size in years 2002 through 2004, we summarized the efficiency scores in those years.
Zeng et al. BMC Health Services Research 2012 12:74 doi:10.1186/1472-6963-12-74