“…In this systematic review and meta-analysis, 34 studies used the <35 cutoff point [ 20 , 29 , 30 , 33 , 37 , 38 , 40 , 41 , 46 , 49 , 55 , 56 , 59 , 60 , 64 - 67 , 69 - 71 , 73 - 77 , 81 - 84 , 88 , 90 , 92 , 93 , 96 ], 64 studies used the <40 cutoff point [ 10 , 20 , 29 - 39 , 42 - 45 , 47 - 54 , 56 - 58 , 61 - 65 , 68 , 70 , 72 - 76 , 78 - 101 ], and 23 studies used both cutoff points [ 20 , 29 , 30 , 33 , 38 , 49 , 56 , 64 , 65 , 70 , 73 - 76 , 81 - 84 , 88 , 90 , 92 , 93 , 96 ]. Based on the <35 cutoff point, all the studies were cross-sectional.…”