Table 4.

Multiple regression model predicting frequency of driving after smoking marijuana (n = 151)

Predictor	B	[95% CI]	SE	β	p	sr2
Gender	.29	[-.27, .84]	.28	.07	.31	.004
Age	.15	[.06, .23]	.04	.22	.001	.043
Negative expectancies	-.19	[-.41, .04]	.11	-.12	.10	.011
Positive expectancies	-.01	[-.21, .20]	.10	-.01	.94	.000
Perceived peer norms	-.51	[-.68, -.35]	.08	-.47	<.001	.146
Perceived dangerousness	-.52	[-.93, -.11]	.21	-.21	.01	.024
Perceived negative consequences	.29	[-.12, .69]	.21	.10	.16	.008

Notes: CI = confidence interval. Bold indicates statistical significance.