TABLE 1.

Demographics and Auxologic Measurements (Mean ± SD)

	XXY	XYY	Controls	P valuea
n	82	26	50
Age	9.2 ± 2.5	9.5 ± 2.8	9.5 ± 2.9	.87
SES	50 ± 11b	52 ± 10	54 ± 9	.05
Height SDS	0.8 ± 1.1	1.0 ± 1.2	0.1 ± 0.9	.0001a
Weight SDS	0.6 ± 1.2	0.7 ± 1.2	0.5 ± 1.1	.57
Head circumference SDS	0.3 ± 1.5b	1.2 ± 2.1c	0.9 ± 1.4	.03
Tanner stage-pubic hair	1.4 ± 0.8	1.4 ± 1.1	1.3 ± 0.8	.91
Testicular volume SDS (mean of 2)	−1.0 ± 1.6b	2.8 ± 4.1c	1.1 ± 2.5	.0001a
Race (% Caucasian)	81%	88%	78%	.53
General conceptual ability standard score	88 ± 14b	91 ± 17d	110 ± 16	< .0001a

^aANOVA, comparison of 3 groups.

^bP < .05, XXY versus controls, ANOVA (post hoc).

^cP < .05, XYY versus XXY, ANOVA (post hoc).

^dP < .05, XYY versus controls, ANOVA (post hoc).