Intervention group (n=61) Control group (n=107) Mean Difference (95% CI) Standard Error t-statistic P value
Conditional Estimates            
Duration of ART            
MPR if ART ± 995 days (n) 97% (31) 98% (53) -1.1% (-2.5  , 2.3) 0.01 -0.11 0.91
MPR if ART <995 days (n) 98% (37) 84% (53) 14.5% (6.3 , 22.7) 0.04 3.46 <0.01
MPR if ART ± 154 days (n) 98% (61) 89% (107) 9.5% (4.9, 14) 0.02 4.06 <0.01
MPR if ART ± 230 days (n) 99% (60) 88% (103) 10.7% (6.3, 15) 0.02 4.71 <0.01
MPR if ART ± 231 days (n)* 99% (60) 98% (101) 0.6% (-2.1, 3) 0.01 0.42 0.67
MPR if ART ± 250 days (n) 99% (59) 98% (98) 0.05% (-1.2, 2) 0.009 0.06 0.95
Baseline BMI, kg/m2            
MPR if  BMI is <18.5 (n) 99% (12) 66% (15) 33.3% (10.8 , 55.9) 0.12 2.9 <0.01
MPR if  BMI is ± 18.5 (n) 98.35% (45) 98.32% (92) 0.03% (-0.019 , 0.02) `0.01 0.03 0.98
Baseline Stage of Disease            
MPR if  HIV disease stage I or II (n) 99% (31) 98% (68) 0.8% (-2.6 , 4.1) 0.02 0.45 0.65
MPR if  HIV disease stage III or IV (n) 99% (15) 78% (19) 20.9% (-2.8 , 44.6) 0.12 1.73 0.09
Baseline CD4 count, , mean cells/μl            
MPR if CD4+lymphocyte count <350 (n) 99% (24) 80% (44) 18.9% (10.8 , 27.0) 0.04 4.57 <0.01
MPR if CD4+ lymphocyte count >350 (n) 98% (44) 94% (63) 4.8% (1.8 , 7.7) 0.02 3.19 <0.01
Abbreviations: ART, antiretroviral therapy; BMI, body mass index; MPR, medication possession ratio. Total N for matching is 175 reduced to 168 observations after imposing common support (7 treated cases not on support). Overall estimates, N=61 (intervention), 107 (control).
*Difference in MPR between arms was no longer significant when participants with >230 days of ART or greater were included in the analysis.
Table 6: Conditional estimates of the impact of food assistance on adherence after six months.