Table 3.

Characteristics of trajectory class membership

Characteristic	Nonsmokers compared to slow smoking progressors			Nonsmokers compared to fast smoking adopters			Slow smoking progressors compared to fast smoking adopters
		95% CI			95% CI			95% CI
	OR	Low	High	OR	Low	High	OR	Low	High
Female	1.26	0.73	2.19	1.44	0.77	2.69	1.14	0.62	2.07
Non-white	1.05	0.59	1.87	1.46	0.71	2.97	1.39	0.68	2.85
Delay discounting	0.74	0.57	0.96	0.69	0.51	0.94	0.95	0.78	1.17
Novelty seeking	0.73	0.55	0.96	0.65	0.46	0.93	0.97	0.89	1.06
ADHD-Attention	1.02	0.94	1.10	1.00	0.91	1.09	0.98	0.91	1.06
ADHD-Hyperactivity	1.01	0.94	1.09	1.07	0.97	1.17	1.06	0.97	1.15
Depression symptoms	0.99	0.96	1.02	0.96	0.93	1.00	0.98	0.95	1.01
Academic performance	1.73	1.00	3.00	2.71	1.49	4.92	1.56	0.87	2.82
Alcohol use	0.31	0.18	0.54	0.33	0.18	0.59	1.04	0.79	1.37
Marijuana use	0.19	0.01	2.81	0.11	0.01	1.55	0.59	0.39	0.89
Peer smoking	0.81	0.70	0.95	0.63	0.53	0.75	0.78	0.67	0.89
Household smoking	1.59	0.81	3.13	0.93	0.45	1.96	0.59	0.30	1.15

Note. The results are from a multinomial logistic regression analysis. Confidence intervals containing 1.00 are not significant, p < .05. For delay discounting, a unit is one standard deviation (SD=1.41). Female (1=Male, 2=Female); Non-white (0=white, 1=non-white); Alcohol use (30-day alcohol use, 1=0 days to 7=20 or more days); Marijuana use (30-day marijuana use, 1=0 times to 6=40 or more times); Household smoking (1=at least one household member smokes, 0=nobody living at home smokes); Academic performance (1=Mostly D’s and F’s to 4=Mostly A’s).