“…A total of 387,437 participants (49% of boys and 51% of girls) aged 3–18 years were included in this systematic review and meta-analysis, of which 11,768 were preschoolers (3–5 years; 3%), 76,928 (6–12 years; 20%) were children, and 298,741 (13–18 years; 77%) were adolescents. Twenty-six studies were conducted with preschoolers only, 8 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 13 studies with children only, 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 17 studies with adolescents only, 11 , 12 , 60 , 62 , 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 , 71 , 72 , 73 , 74 , 75 and 7 studies with both children and adolescents. 9 , 10 , 76 , 77 ...…”