TABLE 1.

Comparison of Age, Cognitive Scores, and Beery VMI results in XXY and XXYY

	XXY N=64	XXYY N=46	T-test p-value
Age
Mean (SD)	12.2 (3.48)	13.3 (4.46)	0.149
Range	4.8–21.5	4.4–20.2
IQ- (WASI or WISC-IV)
Verbal- Mean (SD)	92.7 (17.37)	75.9 (14.36)	<0.001*
Range	53–119	53–102
Performance- Mean (SD)	100.6 (15.74)	87.1 (12.99)	<0.001*
Range	61–129	63–108
Full Scale- Mean (SD)	96.1 (17.74)	79.9 (14.86)	<0.001*
Range	46–125	47–121
Vineland-2
Communication- Mean (SD)	84.6 (17.80)	63.8 (19.99)	<0.001*
Range	36–117	25–112
Daily Living Skills- Mean (SD)	89.7 (17.99)	73.9 (14.12)	<0.001*
Range	40–134	43–102
Socialization- Mean (SD)	89.1 (18.70)	75.2 (13.3)	<0.001*
Range	47–135	46–97
Motor- Mean (SD)	105.8 (15.35)	96.7 (18.56)	0.05
Range	67–121	70–121
Adaptive Beh. Composite- Mean (SD)	86.9 (17.30)	71.9 (11.51)
Range	43–135	46–98	<0.001*
Beery Visual Motor Integration Means (SD)
Visual Motor Integration	92.3 (14.35)	81.5 (11.26)	<0.001*
Visual Perception supplementary test	99.6 (15.14)	88.2 (13.58)	<0.001*
Motor Coordination supplementary test	87.5 (16.88)	77.7 (15.45)	0.003*

^*p<0.05 for T-test comparing XXY to XXYY