Table 2 Pooled prevalence estimates for IPIs among intellectually disabled individuals stratified according to sub-groups in Iran, 2020
Variables | No. of studies | Pooled prevalence estimates | Heterogeneity | |||
|---|---|---|---|---|---|---|
Sample size | Positives | Prevalence (95% CI) | I2 (%) | Q-p | ||
Region | ||||||
 Center | 5 | 1135 | 596 | 61 (49–72) | 93.9 |  < 0.001 |
 North | 5 | 1169 | 430 | 21 (10–32) | 95.7 |  < 0.001 |
 North-east | 2 | 441 | 117 | 30 (25–34) | – | – |
 South | 2 | 259 | 120 | 51 (45–57) | – | – |
Study period | ||||||
 1991–2000 | 2 | 588 | 342 | 58 (54–62) | – | – |
 2001–2010 | 6 | 1334 | 605 | 42 (19–64) | 98.9 |  < 0.001 |
 2011–2020 | 6 | 1082 | 316 | 35 (19–50) | 97.1 |  < 0.001 |
Sample size | ||||||
 < 200 | 7 | 1029 | 403 | 37 (19–54) | 98.4 |  < 0.001 |
 200–300 | 4 | 942 | 479 | 50 (24–76) | 99.1 |  < 0.001 |
 300 <  | 3 | 1033 | 403 | 39 (20–59) | 98.8 | – |
Diagnostic method | ||||||
 D-F | 3 | 580 | 197 | 27 (0–56) | – | – |
 D-F-G | 3 | 748 | 501 | 68 (55–80) | – | – |
 D-F-S | 5 | 1036 | 333 | 34 (21–48) | 96.0 |  < 0.001 |
 D-F-S-C | 3 | 640 | 232 | 39 (26–52) | – | – |
Risk of bias | ||||||
 Low | 9 | 2123 | 884 | 42 (27–56) | 98.3 |  < 0.001 |
 Medium | 5 | 881 | 379 | 40 (16–64) | 98.7 |  < 0.001 |
Overall | 14 | 3004 | 1263 | 41 (29–53) | 99.8 |  < 0.001 |