Assessment Period | Cohort M | SD | National Norm M | t | p | Cohen’s d |
January 2020 | 525.23 | 43.04 | 552.5 | −28.37 | <0.001 | 0.60 |
August 2020 | 532.76 | 46.16 | 557.5 | −24.00 | <0.001 | 0.54 |
January 2021 | 545.22 | 47.26 | 590.5 | −42.91 | <0.001 | 0.96 |
May 2021 | 553.16 | 49.45 | 616.0 | −56.91 | <0.001 | 1.27 |
August 2021 | 556.35 | 48.40 | 616.0 | −55.19 | <0.001 | 1.23 |