Table 2.

CCC-2 composite scores (a high score indicates better language ability): means and standard deviations, Levene’s test for equality of variances, t-test, and effect size for the NS group and the TD group.¹

	Groups
	NS		TD				t-test for equality of means
n/gender (male/female)	17 (12/5)		17 (11/6)		Levene’s test for equality of variances					95% confidence interval of the difference
	Mean	SD	Mean	SD	F	Significance	t (df)	p	Mean difference	Lower	Upper	Effect size d
General communication composite	44.53	19.93	82.18	16.75	1.24	.27	−5.964(31)	<.001	−37.65	−50.52	−24.77	2.05
Social interaction deviance score	−0.47	10.0	1.59	5.97	3.83	.06	0.73(26)	ns	−2.06	2.06	−7.87	0.25
Pragmatic composite	26.12	13.05	51.88	11.33	.71	.41	6.15(32)	<.001	−25.76	−25.76	−34.30	2.11

¹Student’s independent sample t-test.

CCC-2= Children’s Communication Checklist Second Edition; NS = the group with Noonan syndrome; TD= typically developing comparison group.