Table 1.

Demographic Information by Diagnostic Group

Characteristic	Williams syndrome			Mixed etiologies			t or χ2
	Mean/%	SD	Range	Mean/%	SD	Range
Child gender (% male)	39.1			40			.004
Child ethnicity (%)
Caucasian	95.7			74.1
Hispanic				14.8			5.14
Native American				3.7
Biracial	4.3			7.4
Child
CA	47.83	18.53	27–100	43.57	13.93	24–71	−.93
Overall MA	25.94	6.76	15.75–42.25	28.81	12.62	13–67.5	.88
Verbal MA	32.45	14.33	15.50–83	27.48	11.02	11–62	−1.37
Mothers
Age (years)	33.65	5.34	20–42	37.72	6.47	26–54	2.43*
Education level	4.52	1.16	2–5	3.86	1.12	2–6	2.06*
Fathers
Age (years)	35.61	7.61	21–51	40.07	6.21	30–57	2.31*
Education level	4.17	1.03	2–6	4.21	1.11	2–6	.11

^*p <.05.