Table 5.

Estimated parameters for combined alcohol-cannabis model in a school sample of adolescents assessed over 5 years^a.

	Working memory			Perceptual reasoning			Delayed recall memory			Inhibition control
	Estimate	SE	p	Estimate	SE	p	Estimate	SE	p	Estimate	SE	p
Intercept	20.65	1.53	0.00	15.62	0.43	0.00	17.79	0.49	0.00	35.39	3.05	0.00
Time	−6.49	0.99	0.00	1.20	0.27	0.00	−9.56	0.33	0.00	−9.35	1.98	0.00
Time squared	0.80	0.17	0.00	−0.09	0.05	0.04	1.99	0.05	0.00	0.94	0.33	0.00
SES*	0.14	0.08	0.09	−0.08	0.03	0.00	−0.04	0.02	0.04	0.42	0.16	0.01
Gender (female)	0.96	0.67	0.15	0.10	0.21	0.62	0.17	0.17	0.32	1.68	1.29	0.19
Cannabis, B*	0.61	0.45	0.17	−0.27	0.14	0.06	−0.17	0.12	0.15	3.06	0.86	0.00
Cannabis, W*	0.14	0.18	0.45	−0.02	0.05	0.71	−0.11	0.06	0.08	−0.33	0.38	0.39
Cannabis, W (lagged)	−0.31	0.19	0.09	0.13	0.05	0.01	0.13	0.06	0.03	−0.22	0.38	0.57
Alcohol Frequency, B	−0.94	0.38	0.01	0.24	0.12	0.05	0.19	0.10	0.06	−1.73	0.73	0.02
Alcohol Frequency, W	−0.20	0.18	0.26	0.06	0.05	0.19	0.04	0.06	0.51	0.42	0.35	0.23
Alcohol Frequency, W (lagged)	−0.03	0.18	0.88	−0.02	0.05	0.63	−0.05	0.06	0.40	−0.67	0.36	0.06
Gender (male) × Cannabis, B	0.25	0.58	0.67	−0.10	0.18	0.57	0.03	0.15	0.86	−1.08	1.14	0.35
Gender (male) × Cannabis, W	−0.65	0.26	0.01	−0.03	0.07	0.68	0.09	0.08	0.29	−0.15	0.54	0.78
Gender (male) × Cannabis, (lagged)	0.50	0.26	0.06	−0.01	0.07	0.94	−0.10	0.08	0.22	0.33	0.55	0.55
Gender (male) × Alcohol, B	0.49	0.51	0.34	−0.02	0.16	0.89	−0.04	0.13	0.75	1.22	0.99	0.22
Gender (male) × Alcohol, W	0.32	0.24	0.19	−0.12	0.07	0.09	−0.02	0.08	0.84	−0.21	0.50	0.67
Gender (male) × Alcohol (lagged)	−0.09	0.25	0.73	0.09	0.07	0.20	0.06	0.08	0.44	0.64	0.51	0.21

^aSignificant effects are indicated by boldface. Performance on working memory and inhibitory control tasks was measured by counting number of errors; a lower score indicates a better performance. *SES, socioeconomic status; B, between-subjects; W, within-subjects. Bold values correspond to significant predictors.