. Author manuscript; available in PMC: 2014 Aug 1.

Published in final edited form as: Addiction. 2013 May 16;108(10):1845–1854. doi: 10.1111/add.12214

Table 3.

Fixed and random effects for the unconditional latent growth models, by recent substance use outcome among male and female adolescents aged 11 to 17

	Cigarettes (n=6,366)	Alcohol (n=6,353)	Marijuana (n=6,397)
Fixed effects
Intercept	−5.987^***	−5.351^***	−9.193^***
Slope	1.586^***	1.516^***	2.665^***
Quadratic	−0.166^***	−0.138^***	−0.268^***
Random effects
Intercept	10.631^***	9.354^***	14.584^***
Slope	4.059^***	4.075^***	7.477^***
Quadratic	0.104	0.080^***	0.163^**

p<.05,

^**

p<.01,

^***

p<.001

Note: When modeling dichotomous or ordinal data, MPlus uses thresholds as a corrective procedure. In order to have an identified model the thresholds were fixed to zero. The intercept is thus interpreted as the amount of deviation from 50 percent probability of the outcome.