TABLE 2.
Summary of included studies in the meta-analysis
| Number of studies | ||
|---|---|---|
| Outcome categories | n | % |
| World Bank Income Groups | ||
| Low-income | 2 | 7 |
| Lower-middle income | 10 | 37 |
| Upper-middle income | 15 | 56 |
| World Bank Regions | ||
| African Region | 5 | 19 |
| Eastern Mediterranean Region | 8 | 29 |
| European Region | 1 | 4 |
| Region of the Americas | 5 | 19 |
| South-East Asia Region | 5 | 19 |
| Western Pacific Region | 3 | 10 |
| Size of the population assessed | ||
| Urban | 19 | 70 |
| Rural | 1 | 4 |
| Mixed | 1 | 4 |
| Urban and rural subgroups in same paper | 3 | 11 |
| Unknown | 3 | 11 |
| Genders included in papers | ||
| Female only | 19 | 70 |
| Male only | 4 | 15 |
| Female and male | 4 | 15 |
| Method of age determination | ||
| Not stated | 24 | 89 |
| Known date of birth | 2 | 7 |
| School records | 1 | 4 |
| Pubertal milestones assessed | ||
| AAM | 14 | 52 |
| Tanner Stages | 10 | 37 |
| AAM and Tanner Stages | 3 | 11 |
AAM, age at menarche.