*3.2. Characteristics of Included Studies*

Twenty-seven studies (Appendix A, Table A2) [19,25,35–59] with a sample size of 90,879 students were finally assessed for generating pooled estimates. Eighteen studies were from Asia (14 from China, 1 from India, 1 from Israel, 1 from Jordan, and 1 from Saudi Arabia), seven were from Europe (two from Turkey, one from France, one from Greece, one from Italy, one from Russia and Belarus, and one from Albania), and two were from South and North America (one each). The median number of individuals across studies ranged from 66 to 44,447, with males constituting only 35% (*n* = 31,536) of the entire population. The remaining 50.4% (*n* = 45,824) of the sample constituted females. For the remaining 15% of the gender data, individual estimates for students were not provided.
