. Author manuscript; available in PMC: 2012 Apr 1.

Published in final edited form as: Suicide Life Threat Behav. 2011 Feb 22;41(2):180–192. doi: 10.1111/j.1943-278X.2011.00017.x

TABLE 3.

Developmental Changes in Impulsivity from Ages 10 to 25 in a Population-Based Cohort of 770 Individuals

Covariates	Model 1 β (SE)	Model 2^a β (SE)	Model 3^a β (SE)
Random effects
Intercept (at age 17)	0.451 (0.033)^***	0.436 (0.032)^***	0.430 (0.032)^***
Linear slope	0.003 (0.001)^**	0.003 (0.001)^**	0.003 (0.001)^**
Residual	0.468 (0.024)^***	0.472 (0.004)^***	0.468 (0.024)^***
Fixed effects
Intercept (at age 17)	0.096 (0.031)^**	0.059 (0.046)	0.043 (0.045)
Annual linear age change	−0.020 (0.005)^***	−0.019 (0.005)^***	−0.018 (0.005)^***
Quadratic age change	−0.004 (0.001)^***	−0.005 (0.001)^***	−0.004 (0.001)^***
Maternal risk^b		0.284 (0.085)^***	0.276 (0.084)^***
Youth history of abuse^c		0.151 (0.075)^*	0.143 (0.074)
Suicide attempt			0.435 (0.105)^***
Suicide attempt × Age			−0.075 (0.025)^**
Goodness of fit
Parametrics	6	8	10
−2 log likelihood	5911.5	5872.7	5850.4
Chi-square		38.8^***	22.3^***
Degrees of freedom		2	2

Models controlled for sex.

Maternal history of major depression or suicide attempt.

Youth was physically or sexually abused before age 18.

p < .05;

^**

p < .01;

^***

p < .001.