| Study excluded | Prevalence (%) | 95% CI |
| Lisa C. Barry et al., 2017 [24] | 37.3 | 27.5-48.3 | Chen et al., 2017 [25] | 35.2 | 27.0-44.3 | Osasona and Koleoso, 2015 [9] | 35.7 | 26.4-46.3 | Yi et al., 2017 [26] | 38.0 | 27.7-49.6 | Shrestha et al., 2017 [27] | 36.9 | 27.2-47.9 | Yener Unver et al., 2013 [8] | 36.3 | 26.8-47.0 | Beyen et al., 2017 [28] | 36.7 | 27.0-47.5 | Arnal R., et al., 2018 [29] | 37.4 | 27.5-48.5 | Bedaso et al., 2018 [6] | 36.3 | 26.7-47.0 | Baier A., et al., 2016 [30] | 36.7 | 27.0-47.5 | Danny J. O’Sullivan et al., 2018 [31] | 36.8 | 27.1-47.7 | Værøy, 2011 [7] | 36.6 | 27.0-47.5 | Sheford et al., 2018 [32] | 35.3 | 27.1-47.7 | Murdoch N., et al., 2008 [33] | 36.5 | 27.0-47.5 | Fazel et al., 2001 [34] | 37.1 | 26.0-45.9 | Hamzeloo et al., 2016 [35] | 36.7 | 26.9-47.4 | Andreoli SB et al., 2014 [36] | 37.9 | 27.3-48.1 | Milena P. Pond et al., 2011 [37] | 37.6 | 27.7-48.6 | Mundt AP et al., 2013 [38] | 38.4 | 28.5-49.5 | Holliday et al., 2016 [39] | 35.7 | 26.4-46.3 | Zakir Abdu et al., 2018 [40] | 36.6 | 26.9-47.5 | Alemayehu et al., 2019 [5] | 36.7 | 27.0-47.6 | Palmer, Connelly, 2005 [41] | 35.3 | 25.9-46.1 | Tao-Hsin Tung, 2019 [50] | 38.0 | 28.8-48.2 | Edward BH et al., 2012 [42] | 37.8 | 27.9-48.9 | Santos MM et al., 2019 [43] | 37.5 | 27.4-48.7 | Forry et al., 2019 [44] | 36.7 | 27.0-47.5 | Stephen Allnutt, 2008 [45] | 37.8 | 27.7-49.1 | Abdul Malik et al., 2006 [46] | 37.5 | 27.6-48.5 | Assadi et al., 2006 [51] | 37.2 | 27.3-48.1 | Getaneh et al., 2019 [47] | 35.9 | 26.5-46.5 | Ayhan et al., 2017 [48] | 37.9 | 27.9-49.0 |
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