“…Twelve studies had a higher percentage of females [69,72,73,77,79,81,83,85,90,94,96,99], and only one study (two articles) had a higher percentage of males [70,71]. All studies using students as a population had a higher percentage of females, ranging between 60.0 and 80.0 percent [74,76,84,88,92,97,98]. Four studies on children and adolescents which gave information on gender distribution, illustrated a nearly equal distribution of boys and girls [86,87,89,93].…”