. Author manuscript; available in PMC: 2011 Mar 19.

Published in final edited form as: Neurosci Lett. 2010 Feb 2;472(2):119–122. doi: 10.1016/j.neulet.2010.01.067

Table 1.

Intrapair twin correlations for WCST performance (number of perseverative errors).

Variable	r_MZF (n=84)	r_DZF (n=49)	r_MZM (n=82)	r_DZM (n=70)	r_DZOS (n=82)
Age 12	.28^**	.03	.08	.17	.09
Age 14	.47^***	.20	.45^***	.38^**	-.04

r_MZF and r_DZF are intrapair correlations for female MZ and DZ twins, and r_MZM and r_DZM are intrapair correlations for male MZ and DZ twins, respectively; r_DZOS are intrapair correlations for opposite-sex twin pairs. Significance levels:

p<0.05;

^**

p<0.01;

^***

p<0.001.