“…Outcome measures differentiated between general depression symptoms (63,744 pre-pandemic and 116,858 during pandemic) and clinically relevant depression rates (743,736 pre-pandemic and 751,776 during pandemic). In 15 studies, measurement time point was classified as ‘full lockdown’ (Oxford COVID-19 Stringency Index > 60) [ 21 , 27 – 29 , 31 , 33 , 36 – 39 , 41 – 43 , 45 , 47 ], and in 11 studies, schools were partially or fully closed (School Closure Index ≥ 2) [ 21 , 27 , 29 , 31 , 33 , 36 , 37 , 39 , 42 , 43 , 45 ]. Additional unpublished data were provided by 16 studies [ 21 , 27 , 29 – 33 , 36 , 38 – 42 , 45 – 47 ] (in particular, gender and age-stratified data).…”