Table 8.

Personality disorder and marijuana use disorder symptoms from early adolescence to age 38 (N = 600)

PREDICTORS		ESTIMATED EFFECT (SE)
BASIC MODEL
Intercept		1.2345 (0.0127)**
Age at first assessment		−0.0019 (0.0014)
Linear change with age		0.0019) (0.0005)**
Quadratic change with age		−0.00006 (0.00006)
Marijuana symptoms first assessment (Marijuana 2)		0.2365 (0.0248)**
Parental substance use problems		−0.0025 (0.0084)
Family SES		−0.0015 (0.0035)
Axis I disorder		0.0366 (0.0090)**
Sex		0.0306 (0.0064)**
Race		0.0118 (0.0119)
ADDED PD
Paranoid	Effect on mean	0.050 (0.017)**
	Effect on linear slope	0.005 (0.002) *
	Interaction with Marijuana 2	−0.184 (0.076) ***
Schizoid	Effect on mean	−0.013 (0.025)
	Effect on linear slope	0.002 (0.003)
Schizotypal	Effect on mean	0.071 (0.021)**
	Effect on linear slope	0.003 (0.003)
	Interaction with Marijuana 2	−0.372 (0.059)**
Borderline	Effect on mean	0.051 (0.016)**
	Effect on linear slope	−0.004(0.002)*
	Interaction with Marijuana 2	−0.199 (0.052)**
Histrionic	Effect on mean	0.041 (0.014) **
	Effect on linear slope	−0.003 (0.002)
Narcissistic	Effect on mean	0.007 (0.015)
	Effect on linear slope	0.004 (0.002)*
Avoidant	Effect on mean	0.031 (0.018) .10
	Effect on linear slope	0.0065 (0.0023)**
Dependent	Effect on mean	0.023 (0.017)
	Effect on linear slope	−0.003 (0.002)
	Interaction with Marijuana 2	0.947 (0.272)**
Obsessive-Compulsive	Effect on mean	0.009 (0.016)
	Effect on linear slope	0.002 (0.002)
	Interaction with Marijuana 2	0.156 (0.070)*
Passive-Aggressive	Effect on mean	0.050 (0.017)**
	Effect on linear slope	−0.0001 (0.002)
	Interaction with Marijuana 2	−0.397 (0.053)**
Conduct Disorder	Effect on mean	0.098 (0.020)**
	Effect on linear slope	0.007 (0.002)**
	Interaction with Marijuana 2	− 0.143 (0.056)**

Note: All parameter entries are maximum likelihood regression estimates fitted using SAS PROC MIXED and including all covariates. Age was centered by 23.

^*p < .05;

^**p < .01.