A 4-year longitudinal study investigating the relationship between flexible school starts and grades.

2 e) showed that these differences were highly significant for both genders (all p < 0.001; post-hoc to Model 1, Supplementary Table S2 ), except for girls’ grades in Sciences and Social Sciences, which were indistinguishable (b = − 0.47, p = 0.3895; post-hoc to Model 1, Supplementary Table S2 ).

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