“… 99 The remaining studies relied on nonvalidated measures of PA through self-reported questionnaires constructed by the researchers. These questionnaires quantified PA behaviors using several approaches, including subjective reporting of changes, 72 , 78 , 100 , 101 , 102 , 103 , 104 daily duration of PA, 105 , 106 , 107 , 108 , 109 , 110 , 111 , 112 , 113 , 114 , 115 , 116 days per week with at least 60 min of MVPA, 71 , 117 , 118 , 119 , 120 , 121 , 122 , 123 , 124 or frequency of weekly PA, 125 weekly PA duration, 76 , 77 , 118 , 126 outdoor activity, 78 , 116 , 119 , 127 ±3 h of PA per week, 128 , 129 percentage of time spent in PA, 130 , 131 or other means, as detailed in the list of included studies in Supplementary File 5. We identified 3 secondary data analyses.…”