Table 2.

Relative risk ratios from multinomial logistic regression equations predicting early and adolescent-onset marijuana use trajectory classification versus abstaining (N = 718). Results are based on a multiple imputation analysis using 10 replicate data sets.

Variables	Bivariate		M1		M2		M3		M4
	Early	Ad.	Early	Ad.	Early	Ad.	Early	Ad.	Early	Ad.
Fundamental causes/background^b
Female respondent	2.16^**	1.26	2.23^***	1.27	2.14^**	1.22	2.06	1.27	2.11	1.29
	(3.47)	(1.19)	(3.53)	(1.22)	(3.33)	(1.00)	(3.16)	(1.17)	(3.14)	(1.26)
Stressors^c
Negative events (z)	1.47^**	←^a	1.36^***	←	1.46^***	←	1.30^**	←	1.14	←
	(4.81)		(3.59)		(4.24)		(2.78)		(1.22)
Perceived discrimination (z)	1.50^**	1.12	1.35^**	1.01	1.38^**	1.03	1.26^*	1.01	1.15	.97
	(4.00)	(1.27)	(2.85)	(.06)	(3.05)	(.31)	(2.06)	(.07)	(1.25)	(.27)
Parent alcohol abuse (ever)	1.77^**		1.57^*		1.51^*		1.40⁺	←	1.39⁺	←
	(3.34)	←	(2.47)	←	(2.24)	←	(1.81)		(1.73)
Parent major depression (ever)	1.60^*	←	1.35	←	1.29		1.26	←	1.20	←
	(2.42)		(1.40)		(1.21)	←	(1.07)		(.83)
Support ^d
Positive school experiences (z)	.84^*	←			.76^**	←	.85⁺	←	.85⁺	←
	(2.16)				(3.05)		(1.70)		(1.66)
Psychosocial
Positive school attitudes (z)	.70^***	←					.84⁺	←	.92	←
	(.00)						(1.84)		(.84)
Feelings of anger (z)	1.48^***	1.30^**					1.11	1.13	1.10	1.15
	(3.62)	(2.77)					(.85)	(1.22)	(.78)	(1.39)
Depressive symptoms (z)	2.01^***	1.36^**					1.49^**	1.11	1.24	1.07
	(5.47)	(2.91)					(2.79)	(.88)	(1.41)	(.59)
Friend delinquency (z)	2.80^***	1.61^***							2.30^***	1.44^**
	(8.41)	(4.69)							(6.11)	(3.23)
Intercepts
Early-onset			−1.59^***	−1.24^***	−1.60^***	−1.25^***	−1.66^***	−1.24^***	−1.80^***	−1.22^***
			(13.89)	(12.48)	(14.00)	(12.43)	(13.60)	(12.25)	(13.35)	(12.02)

Notes: Variables are entered in groups in models M1–M4. Coefficients for the intercepts are multinomial logit coefficients; other coefficients are relative risk ratios (eb).

t-Ratios are presented in parentheses.

Arrows (“←”) indicate that the parameter has been fixed across the early- and adolescent-onset equations.

The other background variables were not statistically significant so they have been excluded.

Financial strain and parent perceived discrimination were not statistically significant.

The other support variables were not statistically significant.

⁺

p < .1.

p < .05.

^**

p < .01.

^***

p < .001 (two-tailed).