Table 2.
Analysis | Arms | Studies (n) | References | INSTIs group (n) | Non-INSTIs group (n) | RR (95% CI) | Heterogeneity (I2), P value | Subgroup analysis: P value, heterogeneity (I2) |
Interpretation of subgroup analysis |
All studies | INSTIs versus PI and/or NNRTIs | 13 | 27 30 38–41 43–49 | 27 610 | 44 794 | 0.80 (0.67 to 0.96) | 29% | – | – |
INSTI versus other drug classes | INSTI versus PI | 6 | 27 30 39 41 43 47 | 24 771 | 21 049 | 0.78 (0.61 to 1.01) | 27% | 0.74, 0% | No subgroup effect, minimal heterogeneity |
INSTI versus NNRTI | 7 | 27 30 38 40 45 46 48 | 10 350 | 17 842 | 0.75 (0.63 to 0.89) | 0% | |||
By ART status at baseline | ART-naïve | 11 | 27 30 38–41 43–46 48 | 17 940 | 37 972 | 0.78 (0.65 to 0.94) | 3% | 0.29, 23% | No subgroup effect, minimal heterogeneity |
ART-experienced | 2 | 47 49 | 8900 | 1389 | 0.85 (0.43 to 1.68) | 0% | |||
By presence of conflict of interest | Reported conflict of interest | 9 | 30 38–40 43 45 47–49 | 22 522 | 21 801 | 0.85 (0.78 to 0.93) | 0% | 0.44, 23% | No subgroup effect, minimal heterogeneity |
No reported conflict of interest | 4 | 27 41 44 46 | 5 088 | 22 993 | 0.65 (0.29 to 1.46) | 59% | |||
By age | Participants ≥18 years | 11 | 27 30 38–41 43–46 49 | 11 798 | 42 371 | 0.77 (0.65 to 0.91) | 26% | 0.07, 29% | Statistically significant, qualitative subgroup effect |
Included participants below 18 years | 2 | 47 48 | 15 812 | 2423 | 1.09 (0.13 to 9.29) | 0% | |||
By study setting | Multicenter | 11 | 27 30 38–41 45–49 | 26 620 | 38 971 | 0.84 (0.77 to 0.93) | 0% | <0.01, 23% | Statistically significant, quantitative subgroup effect |
Single center | 2 | 43 44 | 990 | 5823 | 0.38 (0.13 to 1.11) | 0% | |||
By geographical origin of the study participants | Multinational | 5 | 38–40 45 47 | 1309 | 1277 | 0.87 (0.81 to 0.94) | 0% | <0.01, 13% | Statistically significant subgroup effect by region of origin, qualitative effect |
African | 2 | 46 48 | 1000 | 650 | 2.99 (2.53 to 3.54) | 0% | |||
North American | 3 | 30 41 47 | 20 908 | 20 985 | 0.86 (0.53 to 1.42) | 45% | |||
Europe | 3 | 27 43 44 | 4393 | 21 882 | 0.54 (0.27 to 1.08) | 3% | |||
By study design | RCT | 8 | 38–41 45 48 49 | 2912 | 3135 | 0.88 (0.81 to 0.96) | 0% | 0.27, 12% | No subgroup effect, minimal heterogeneity |
Cohort | 5 | 27 30 43 44 47 | 24 698 | 41 659 | 0.69 (0.44 to 1.10) | 60% | |||
By primary outcome | Virological outcome | 8 | 38–41 45 46 48 49 | 2912 | 3135 | 0.88 (0.81 to 0.96) | 0% | 0.16, 29% | No subgroup effect. Moderate heterogeneity. |
Metabolic outcome | 5 | 27 30 43 44 47 | 24 698 | 41 659 | 0.69 (0.44 to 1.10) | 60% | |||
By follow-up duration | ≥12 months | 8 | 27 30 38 41 43–45 48 | 11 219 | 41 464 | 0.70 (0.53 to 0.94) | 24% | 0.07, 29% | No subgroup effect, minimal heterogeneity |
<12 months | 6 | 39 40 45–47 49 | 16 460 | 3374 | 0.88 (0.79 to 0.99) | 0% | |||
By type of INSTI in ART-naïve patients | Dolutegravir | 7 | 30 39 40 45–48 | 5751 | 17 679 | 0.94 (0.53 to 1.67) | 43% | 0.35, 61% | No subgroup effect, moderate heterogeneity |
Elvitegravir | 2 | 30 47 | 5819 | 16 324 | 0.80 (0.01 to 123.82) | 78% | |||
Raltegravir | 4 | 30 38 41 47 | 2172 | 17 814 | 1.23 (0.91 to 1.66) | 0% | |||
By type of INSTI in ART-experienced patients | Dolutegravir | 2 | 47 49 | 3889 | 1389 | 0.92 (0.21 to 3.99) | 0% | 0.57, 0% | No subgroup effect, minimal heterogeneity |
Elvitegravir | 1 | 47 | 4281 | 1109 | 0.75 (0.48 to 1.17) | – | |||
Raltegravir | 1 | 47 | 730 | 1109 | 1.09 (0.60 to 1.99) | – | |||
By viral hepatitis comorbidities | Hepatitis B and C included | 10 | 27 30 38–41 43–49 | 26 824 | 44 041 | 0.76 (0.58 to 1.00) | 67.2% | 0.88, 12% | No subgroup effect, minimal heterogeneity |
Only hepatitis C included | 3 | 27 30 38–41 43–49 | 786 | 753 | 0.87 (0.78 to 0.98) | 32.8% | |||
By studies providing adjusted risk estimates | 5 | 0.83 (0.58 to 1.18) | 100% | – | – |
the boldfaced values are Statistically significant.
.ART, antiretroviral therapy; INSTI, integrase strand transfer inhibitor; NNRTI, non-nucleoside reverse transcriptase inhibitor; PI, protease inhibitor; RCT, randomized controlled trial; RR, relative risk.