Table 1.

Age and gender characterization of the sample.

	Total (n = 90)		DS (n = 45)		Siblings (n = 45)		p-value
Gender,n (%)
Male	49	(54)	22	(49)	27	(60)	0.290*
Female	41	(46)	23	(51)	18	(40)
Age (years), med (min-max)	13	(6-20)	13	(6-20)	13	(6-18)	0.827**
Age (years),n (%)
(6, 10)	19	(21)	10	(22)	9	(20)	0.682*
(10, 15)	37	(41)	20	(44)	17	(38)
(15, 18)	34	(38)	15	(33)	19	(42)

*Independent chi-square test;

**Mann-Whitney test.