Table 3.

Parameter Estimates from Generalized Estimating Equation Regression

Intervention School versus Control School
Unadjusted Estimates
Outcome	Estimate	SE	OR	NNT	D
Lifetime Alcohol Use	−0.36**	0.12	0.70	14.7
Past Month Alcohol Use	−0.32+	0.17	0.73	31.3
Heavy Drinking in Past Month	−0.32	0.23	0.78	62.5
Perceived alcohol use	−0.13	0.10			−0.06
Alcohol Intentions	−0.23	0.18	0.79	55.6
Resistance Self-Efficacy (Alcohol)	0.02	0.04			0.02
Estimates Adjusted for Baseline Outcome and Covariates
Outcome	Estimate	SE	OR	NNT	D
Lifetime Alcohol Use	−0.36*	0.16	0.70	14.8
Past Month Alcohol Use	−0.21	0.17	0.81	45.0
Heavy Drinking in Past Month	−0.25	0.30	0.78	78.6
Perceived alcohol use	0.03	0.09			0.02
Alcohol Intentions	−0.08	0.07	0.92	77.2
Resistance Self-Efficacy (Alcohol)	0.02	0.03			0.03
Attenders vs Matched Controls
Outcome	Estimate	SE	OR	NNT	D
Lifetime Alcohol Use	−0.30	0.22	0.74	17.6
Past Month Alcohol Use	−0.13	0.27	0.88	76.5
Heavy Drinking in Past Month	−0.21	0.45	0.81	100.7
Perceived alcohol use	0.09	0.15			0.05
Alcohol Intentions	0.10	0.14	1.11	67.4
Resistance Self-Efficacy (Alcohol)	0.01	0.05			0.02

Note: D = standardized difference between groups; NNT = number needed to treat.

⁺p < 0.10,

^*p < 0.05,

^**p < 0.01.