Table 3.
Subgroup analysis of the prevalence of adolescent pregnancy in Africa, 2003–2018
| Subgroup | Number of studies | Total Sample | Prevalence (95%CI) | Heterogeneity | |
|---|---|---|---|---|---|
| I 2 | p-value | ||||
| By Sub-region | |||||
| East Africa | 16 | 36,977 | 21.5 (17.3, 25.7) | 99.1 | < 0.001 |
| Southern Africa | 6 | 24,581 | 20.4(18.9, 21.7) | 73.7 | 0.002 |
| West Africa | 16 | 53,277 | 17.7 (14.1, 21.4) | 99.6 | < 0.001 |
| Central Africa | 7 | 86,792 | 15.8 (10.3, 21.3) | 99.8 | < 0.001 |
| Northern Africa | 2 | 35,626 | 09.2 (05.8, 12.5) | 98.2 | < 0.001 |
| Sub Saharan African countries | 45 | 201,627 | 19.3 (16.9, 21.6) | 99.7 | < 0.001 |
| By study design | |||||
| Cross-sectional (including survey studies) | 37 | 94,569 | 21.3 (18.6, 24) | 99.2 | < 0.001 |
| Retrospective study | 10 | 142,684 | 10.1 (06.9, 13.2) | 99.8 | < 0.001 |
| By study type | |||||
| Community-based | 28 | 68,829 | 20.9 (18.2, 23.7) | 98.9 | < 0.001 |
| Institution-based | 18 | 168,424 | 15.2 (12.5, 17.9) | 99.7 | < 0.001 |
| By type of the document | |||||
| DHS final report | 18 | 56,752 | 20.9 (17.4, 24.3) | 99.1 | < 0.001 |
| Research article | 29 | 180,501 | 17.2 (14.9, 19.5) | 99.7 | < 0.001 |
| By publication status | |||||
| Unpublished studies | 3 | 4828 | 27.7 (23.3, 32.2) | 91.7 | < 0.001 |
| Published studies | 44 | 232,425 | 18.2 (16, 20.3) | 99.7 | < 0.001 |
| By publication year | |||||
| Before 2015 (during MDG period) | 35 | 189,562 | 18.2 (15.9, 20.5) | 99.7 | < 0.001 |
| 2016 to 2018 (post MDG) | 12 | 47,691 | 20.5 (15.1, 25.9) | 99.6 | < 0.001 |
| By quality score | |||||
| Low score | 22 | 164,964 | 16.3 (13.6, 18.9) | 99.7 | < 0.001 |
| High score | 25 | 72,289 | 20.8 (17.3, 24.4) | 99.4 | < 0.001 |
| Total | 47 | 237,253 | 18.8 (16.7, 20.9) | 99.7 | < 0.001 |