“…The studies on the effect of COVID-19-related school closures on student achievement selected for our review reported mixed findings, with effects ranging from -0.37 SD to +0.20 SD (Mdn = -0.10 SD). For mathematics, effects varied between +0.20 SD and -0.19 SD (Mdn = -0.12 SD), with seven studies reporting a negative effect (Clark et al, 2020;Depping et al, 2021;Engzell et al, 2021;Maldonado & De Witte, 2020;Schult et al, 2021;Tomasik et al, 2020) and three studies reporting a positive effect (Gore et al, 2021;Meeter, 2021;Spitzer & Musslick, 2020) of COVID-19-related school closures on student achievement in mathematics. For reading, the effects found varied between -0.29 SD and +0.04 SD (Mdn = -0.14 SD), with six studies reporting a negative effect (Clark et al, 2020;Depping et al, 2021;Engzell et al, 2021;Maldonado & De Witte, 2020;Schult et al, 2021;Tomasik et al, 2020) and one study reporting a positive effect (Gore et al, 2021) of COVID-19-related school closures on student achievement in reading.…”