. Author manuscript; available in PMC: 2010 Mar 11.

Published in final edited form as: Eur J Pers. 2008 May 1;22(3):247–268. doi: 10.1002/per.671

Table 1.

Descriptive statistics and mean-level sex differences in GPA and personality traits.

Variable	Girls M (SD)	Boys M (SD)	Effect Size
GPA	3.19 (.67)	2.85 (.78)	.47^*
Achievement	48.1 (8.3)	50.0 (8.1)	-.23^*
Control	48.1 (7.8)	46.8 (7.1)	.17^*
Aggression	34.4 (8.9)	41.8 (9.2)	-.82^*

Note. GPA = grade point average. Effect sizes are Cohen's d calculated as (M₁ – M₂)/SD_pooled.

p < .01.