Figure 3
From: Sleep improvements on days with later school starts persist after 1 year in a flexible start system
Comparison of subjective psychological benefits between 8AM-days and ≥ 9AM-days in the flexible system. Results from the survey at end of wave 2 asking cohort 2 for the following ratings: (A) ability to concentrate during class (Z = 6.419, d = 1.784, n = 93), (B) quality of study at home after school (Z = 6.055, d = 1.643, n = 91), (C) general wellbeing (Z = 6.559, d = 1.855, n = 93), (D) motivation to attend school (Z = 5.927, d = 1.572, n = 92), (E) attitude towards school (Z = 5.896, d = 1.545, n = 92), and (F) tiredness during class (Z = 5.419,d = 1.369, n = 92). Wilcoxon signed rank test, *p < 0.05, **p < 0.01, ***p < 0.001.
