Table 3.

Measurement invariance of the knowledge test in Study 2

	Correct answers	Mann-Whitney U	Z	p	r
Gender	Pre-test	36,561,5	- 4,19	< 0,001	0,17
	Post-test	36,522,5	- 4301	< 0,001	0,18
School Grade	Pre-test	33,740	− 5704	< 0,001	0,23
	Post-test	35,103	− 5178	< 0,001	0,21
Attendance to previous courses	Pre-test	610,5	− 1031	0,303	0,11
	Post-test	617,5	−0,995	0,32	0,11

Note: Z – z value; r - effect size