Objectives: To document regional and global trends for patients retained on antiretroviral therapy (ART) 12-48 months after treatment initiation, in low-income and middle-income countries.
Methods: Data reported by national programs to WHO/UNICEF/UNAIDS in 2008 were aggregated to produce regional and global estimates. The proportion of patients on ART at 12, 24, 36, and 48 months is derived from cohort monitoring systems in ART dispensing facilities.