Table 3 Sub-group analyses based on sample size, geographical region, age, duration of injection and type of study
Variable | No study | Prevalence 95% Confidence interval (CI) | I2 | P – value |
|---|---|---|---|---|
Sample size | ||||
 ≤ 200 | 22 | 56% (44–68) | 99% | 0.00 |
 > 200 | 20 | 37% (29–46) | 98.1% | 0.00 |
Region | ||||
 North | 1 | 26% (22–30) | – | – |
 West | 9 | 39% (26–53) | 98.6% | 0.00 |
 South | 9 | 59% (41–78) | 96.8% | 0.00 |
 East | 4 | 61% (43–76) | 92.2% | 0.00 |
 Central | 19 | 44% (31–62) | 97.3% | 0.00 |
Age | Â | Â | Â | 0.00 |
 ≤ 30 | 7 | 53% (35–71) | 94.3% | 0.00 |
 > 30 | 20 | 45% (33–56) | 98.4% | 0.00 |
 NA | 15 | 49% (33–64) | 97.3% | 0.00 |
Duration of injection (years) | ||||
 ≤ 3 | 12 | 57% (26–68) | 92.7% | 0.00 |
 > 3 | 11 | 52% (41–83) | 98.3% | 0.00 |
 NA | 19 | 48% (34–59) | 97.1% | 0.00 |
Type of participants | ||||
 Only prisoners | 10 | 52% (38–67) | 98.5% | 0.00 |
 Non-prisoners | 28 | 45% (36–54) | 99.2% | 0.00 |
 Both (Non-prisoners and prisoners) | 4 | 53% (17–89) | 99.6% | 0.00 |