Table 5.

Frequency of use and results of zero-inflated negative binomial regression for primary problem substance in 30 days prior to treatment by sex, sexual orientation, and each specific primary problem substance (separate analyses by sex, adjusted for age, race, ethnicity, and initial treatment episode)

	Male Participants					Female Participants
	Heterosexual	Gay		Bisexual		Heterosexual	Lesbian		Bisexual
	Mdn, M (SD)	Mdn, M (SD)		Mdn, M (SD)		Mdn, M (SD)	Mdn, M (SD)		Mdn, M (SD)
	reference	B	p	B	p	reference	B	p	B	p
Days of use for all primary problem substances in past 30 days	5.00, 11.41 (12.20)	3.00, 8.75 (11.00)		6.00, 11.92 (12.10)		2.00, 9.39 (12.14)	2.00, 9.57 (11.67)		2.00, 10.43 (12.51)
		−0.26*	<.001	−0.02	.845		−0.18	.848	0.07	.38
Days of alcohol use among persons with alcohol as primary problem substance	14.00, 14.78 (12.18)	7.50, 12.10 (11.75)		15.00, 16.42 (12.48)		6.00, 12.30 (12.69)	8.00, 12.51 (12.22)		8.50, 12.78 (12.39)
		−0.13	.064	0.06	.634		0.09	.575	−0.05	.726
Days of cocaine use among persons with cocaine as primary problem substance	4.00, 10.05 (11.07)	4.00, 8.75 (10.35)		6.50, 10.57 (10.43)		4.00, 9.83 (11.71)	0.00, 8.16 (11.62)		1.00, 9.44 (11.94)
		−0.09	.541	0.02	.907		0.02	.916	0.11	.491
Days of heroin use among persons with heroin as primary problem substance	5.00, 11.31 (12.86)	2.0, 9.92 (13.05)		5.0, 12.15 (12.61)		3.00, 10.42 (12.72)	1.00, 6.56 (10.92)		3.00, 11.59 (13.44)
		−0.08	.593	−0.01	.941		−0.11	.566	0.03	.857
Days of marijuana use among persons with marijuana as primary problem substance	8.00, 12.14 (12.11)	20.00, 19.22 (11.78)		12.00, 12.55 (12.37)		4.00, 9.91(11.90)	22.00, 19.22 (9.11)		12.00, 15.48 (14.17)
		0.25	.105	0.09	.775		0.33	.308	0.40	.070
Days of methamphetamine use among persons with methamphetamine as primary problem substance	2.0, 7.14 (10.07)	1.0, 4.90 (7.84)		2.50, 8.72 (11.37)		0.00, 7.62(11.28)	0.00, 5.53 (9.27)		0.00, 5.58 (8.96)
		−0.56*	<.001	0.09	.702		−0.51	.098	−0.42	.080

^*B met the p<.001 criterion