Table 2. Study characteristics.
| Country of Origin | Studies (n) | Author | Mean Age (years) | Male (n) | Female (n) | Sample size (n) | Year of Publication |
| Nigeria | 3 | Hassan and Mabogunje [13] | 4.25 | 22 | 0 | 22 | 1993 |
| Chinda et al. [14] | 6.7 | 46 | 10 | 56 | 2011 | ||
| Abubakar et al. [15] | 6.9 | 63 | 4 | 67 | 2004 | ||
| Egypt | 2 | Badawy et al. [16] | 8.63 | 371 | 129 | 500 | 2012 |
| Shahin [17] | 10.45 | 13 | 7 | 20 | 2002 | ||
| Tunisia | 1 | Alaya et al. [18] | 8.6 | 184 | 126 | 310 | 2012 |
| Ethiopia | 1 | Metaferia and Shimelis [19] | NA | 54 | 9 | 63 | 2014 |
| Sudan | 1 | Elfadil et al. [20] | 4.96 | 129 | 46 | 175 | 2010 |
| Somalia | 1 | Eraslan et al. [21] | 12.7 | 127 | 100 | 227 | 2022 |
| Morocco | 1 | Meiouet et al. [22] | 8 | 302 | 130 | 432 | 2019 |