Table 2. Individual ANCOVAS for the differences in the CC volumes between the 22q11DS and control groups with ICV, site of MRI, age and gender as covariates (22q11DS=59 and controls=53).

CC region	22q11DS subjects mean (SD)	Control subjects mean (SD)	Df and number	F	Effect size (partial eta-squared)	Site effect (F)	Site × group interaction (F)
Genu	0.3949 (0.9386)	−0.4396 (0.8819)	1, 112	33.03**	0.23	0.34	2.71
Posterior Genu	−0.0404 (1.132)	0.0449 (0.8371)	1, 112	0.02	0.00	0.41	0.06
Truncus	−0.3187 (1.040)	0.3548 (0.8265)	1, 112	10.55*	0.09	0.02	0.83
Anterior Splenium	−0.0368 (1.088)	0.0410 (0.9001)	1, 112	0.04	0.00	0.00	0.88
Splenium	0.3043 (1.097)	−0.3388 (0.7547)	1, 112	19.21**	0.15	0.00	3.38
Total CC	0.1603 (1.096)	−0.1785 (0.8554)	1, 112	7.65*	0.06	0.13	2.39

Degrees of freedom and number of scans are 1 and 112, respectively.

Medium (0.09) and large (0.25) effect sizes are in bold.

^*P>0.01.

^**P<0.001.