Table 2.

Differences between boys and girls in mathematical achievement per grade.

	Boys	Girls
	Mean (SD)	Mean (SD)	η2	p-Value
Grade 2	175.2 (29.6)	159.8 (27.5)	0.07	<0.01*
Grade 3	154.2 (76.3)	141.4 (71.4)	0.01	0.38
Grade 4	90.5 (10.9)	83.9 (13.6)	0.07	<0.01*
Grade 5	105.4 (11.2)	100.3 (13.9)	0.04	<0.04*
Grade 6	114.7 (9.9)	115.5 (11.3)	<0.01	0.69

^∗p < 0.05.