Table 4.

Comparing Sexual Minorities and Completely Heterosexual Siblings (n = 1,686).

Variable (year assessed)	Lesbian/gay, bisexual, mostly heterosexual (n=194) % (n)	Completely heterosexual (n=1,492) % (n)	OR (95% CI)	Cochran-Mantel-Haenszel χ2	Number of families contributing to estimation
Lifetime Substance Use (2007)
Smoking at least 100 cigarettes	34.0 (66)	20.6 (308)	1.98 (1.13, 3.47)*	5.86	56
Any illicit non-marijuana drug use	42.8 (83)	15.8 (236)	2.68 (1.53, 4.70)***	12.74	62
Any prescription drug misuse	39.2 (76)	20.2 (301)	2.47 (1.46, 4.20)***	11.80	67
Past-Year Substance Use (2007)
Any cigarette smoking	52.1 (101)	29.5 (440)	2.44 (1.47, 4.06)***	12.72	73
Binge drinking (≥ 3 times)	71.7 (139)	57.6 (859)	1.58 (0.97, 2.56)	3.42	69
Any marijuana use	46.9 (91)	25.1 (374)	1.66 (1.02, 2.71)*	4.20	69
Any illicit non-marijuana drug use	23.2 (45)	8.9 (132)	2.02 (1.08, 3.78)*	5.05	45
Any prescription drug misuse	25.3 (49)	13.3 (198)	1.92 (1.08, 3.43)*	4.97	52
Other Theoretical Variables+
Childhood gender nonconforming behaviors (2005)	80.9 (157)	58.9 (879)	2.59 (1.52, 4.42)***	13.09	68
Attachment (2005)	35.1 (68)	52.7 (786)	0.50 (0.31, 0.82)***	8.05	72
Maternal affection (2006)	37.1 (72)	52.9 (789)	0.51 (0.28, 0.92)*	5.15	48
Covariate
Depressive distress (2003)	45.4 (88)	27.9 (417)	2.04 (1.25, 3.34)**	8.50	72
Substance use (2005)	78.4 (152)	58.0 (866)	2.13 (1.27, 3.57)***	8.68	65

⁺Continuous variables were dichotomized as high/low using the median split.

^*p<0.05

^**p<0.01

^***p<0.005