Table 1.

Sample demographic information

Characteristic	Time 1		Time 3
	Sibling 1	Sibling 2	Sibling 1	Sibling 2
Age	13.5 (2.0)	12.1 (1.3)	26.8 (2.5)	25.5 (2.6)
Age range	10–18	9–18	20–35	20–35
Age difference	1.6 (1.3)		1.23 (1.6)
Female	48.4%		48%
Married	—	—	59%	50%
Mean education	—	—	14.9 (2.3)	14.6 (2.3)
	Mother	Father	Mother	Father
Parent age	38.1 (5.2)	41.0 (6.5)	51.4 (4.6)	54.2 (6.1)
Parent education (years)	13.8 (2.3)	13.9 (2.7)	14.2 (2.7)	14.6 (2.8)

Note: The values are means (standard deviations).