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