Subgroup analysis results of the included studies
| Subgroup analysis | Variables | No of studies | Prevalence (95% CI) | Weight (%) | I2 |
| By country | Ethiopia | 2 | 41.4 (33.9 to 48.8) | 19.9 | 68.6 |
| Nigeria | 6 | 25.1 (20.4 to 29.6) | 60.6 | 94.8 | |
| Congo | 1 | 4.9 (4.1 to 5.76) | 10.46 | 0 | |
| Zimbabwi | 1 | 45.4 (36.1, 54.7) | 9.1 | 0 | |
| Publication year | Less than 2014 | 4 | 26.1 (5.47 to 46.7) | 39.13 | 88 |
| Greater than or equal to 2014 | 6 | 29.13 (23.3 to 34.9) | 60.87 | 89 | |
| Sample size | Less than 384 | 4 | 40.2 (34.5 to 45.8) | 38.9 | 66 |
| Greater than or equal to 384 | 6 | 20.3 (11.3 to 29.4) | 61.2 | 88 | |
| Study design | Cross-sectional | 6 | 29.5 (18.0 to 41.0) | 60.68 | 98 |
| Cohort | 4 | 25.4 (17.2 to 33.7) | 39.32 | 90 |