Table 2.

Descriptive Statistics for KBIT-2 Standard Scores (SSs) and Scaled Scores and Correlations with Chronological Age (CA) for 4- to 17-year-olds with Williams Syndrome

KBIT-2 Component	Descriptive Statistics				Correlations with CA
	Mean	Median	SD	Range	Spearman rho (p-value)
IQ Composite SS	73.50	74.00	15.44	40 – 111	−.06 (.35)
Verbal SS	76.57	77.00	14.81	40 – 112	−.08 (.18)
Nonverbal SS	76.78	78.50	15.82	40 – 112	−.01 (.85)
Verbal Knowledge scaled score	6.22	6.00	2.86	1 – 13	−.13 (.02)
Riddles scaled score	5.17	5.00	2.73	1 – 13	−.06 (.30)