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Table 3 Subgroup analysis of the prevalence of adolescent pregnancy in Africa, 2003–2018

From: Prevalence and determinants of adolescent pregnancy in Africa: a systematic review and Meta-analysis

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 Unpublished studies 3 4828 27.7 (23.3, 32.2) 91.7 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