Table 3.

Regressions using Personal Beliefs, Peer Norms, and Parent Norms to Predict Current and Future Substance Use

Current Substance Use±	B	β	t	Effect Size
Alcohol
Personal Beliefs	.35	.27	1.82	.02
Peer Norms	.38	.44**	2.88	.06
Parent Norms	.17	.06	.87	.01
Tobacco
Personal Beliefs	−.39	−.33	−1.79	.03
Peer Norms	.55	.32**	3.65	.15
Parent Norms	.28	.16	1.23	.02

Future Substance Use	B	β	t	Effect Size
Alcohol §
Personal Beliefs	.71	.51*	2.22	.12
Peer Norms	−.23	−.19	−.84	.02
Parent Norms	.29	.13	.77	.01
Tobacco§§
Personal Beliefs	.02	.08	.36	.00
Peer Norms	.01	.05	.25	.00
Parent Norms	.00	.00	.00	.00

Note: Peer Norms = Perceived peer beliefs about substance use; Parent Norms = Perceived parent beliefs about substance use; Effect size refers to the squared semi-partial correlation and was interpreted as follows: 0.10 to 0.30 small effect, 0.31 to 0.50 medium effect, and 0.51 to 0.80 large effect.

^*p < .05,

^**p <. 01

^±n = 68,

^§n = 38,

^§§n = 53