Table 3.

Logistic regression of risk and protective personal/behavioral factors associated with the trajectories of marijuana use over time: Adjusted odds ratio (A.O.R.) adjusted for gender, age, family income, and parental educational level.

Independent Variables	C vs. N A.O.R. (95% C.I.)	C vs. O A.O.R. (95% C.I.)	C vs. I A.O.R. (95% C.I.)	C vs. Q A.O.R. (95% C.I.)	Q vs. N A.O.R. (95% C.I.)	Q vs. O A.O.R. (95% C.I.)	Q vs. I A.O.R. (95% C.I.)	I vs. N A.O.R. (95% C.I.)	I vs. O A.O.R. (95% C.I.)	O vs. N A.O.R. (95% C.I.)
Self-control (High)	.35*** (.25–.49)	.52** (.35–.77)	N.S.	.67** (.50–.91)	.53*** (.42–.67)	N.S.	N.S.	.54*** (.38–.76)	N.S.	.78* (.63–.96)
Externalizing Behavior	6.13*** (3.95–9.52)	3.52*** (2.10–5.87)	2.82*** (1.60–4.94)	1.93*** (1.41–2.63)	3.02*** (2.28–4.00)	1.81*** (1.27–2.58)	1.75* (1.10–2.80)	1.68* (1.12–2.53)	N.S.	1.54** (1.19–2.02)
Sensation Seeking	2.18*** (1.65–2.88)	1.62* (1.11–2.38)	N.S.	1.78** (1.23–2.58)	1.62*** (1.31–2.01)	N.S.	N.S.	N.S.	N.S.	N.S.
Internalizing Behavior	1.41* (1.06–1.88)	N.S.	N.S.	N.S.	1.54*** (1.24–1.91)	N.S.	N.S.	N.S.	N.S.	N.S.
Educational Expectations & Aspirations (High)	.72* (.54–.97)	.51** (.34–.76)	N.S.	N.S.	N.S.	.63** (.46–.87)	N.S.	N.S.	N.S.	N.S.

^*p<.05;

^**p<.01;

^***p<.001 (two-tailed tests);

Each of the independent variables was continuous and standardized;

C=Chronic user; Q=Quitter/Decreaser; I=Increasing User; O=Occasional user; N=Non/experimental user.