“…By study design, ten studies were conducted using a cross-sectional study design (18,24,27,31,32,33,34,36,38,39), two studies were conducted using a case control study design (30,40), eight studies were conducted using a retrospective cohort stud (19,20,25,26,28,29,35,41) and one study was conducted using a prospective cohort study (37). Nine studies were conducted on rst-line ART patients (20,25,30,32,33,35,36,37,41), nine studies were conducted on both rst-and second-line ART patients (18, 19,24,27,28,31,34,38,39,40), and two were conducted on second-line ART patients (26, 29). The minimum sample size was 152 taken in the study in Arba Minch (37), and the maximum sample size was 19,525 used in the study in the Tigray region (39) for detail (Table 1).…”