Table 2.

Estimates and 95% Confidence Intervals for Main Effect of Predictors on Presanction Drinking and Intervention Effects for All Outcome Variables

	Presanction drinking factor			Intervention effect factor
Predictor	Lower bound	Estimate	Upper bound	Lower bound	Estimate	Upper bound
Readiness to changea
Drinks per typical week	−0.09	0.05	0.19	−0.33	−0.20	−0.01
Drinks per drinking day	−0.01	0.02	0.06	−0.10	−0.06	−0.02
Drinks per heaviest week	−0.06	0.16	0.32	−0.49	−0.31	−0.08
Peak BAC	.000	.002	.004	−.005	−.003	−.001
Heavy drinking frequency	−0.07	−0.01	0.07	−0.17	−0.07	0.05
RAPI total score	0.08	0.17	0.24	−0.16	−0.10	0.00
AUDIT statusb
Drinks per typical week	11.32	13.41	15.63	−7.20	−3.71	−1.03
Drinks per drinking day	2.46	2.88	3.47	−1.13	−0.48	0.26
Drinks per heaviest week	12.36	16.82	19.70	−6.39	−3.35	0.80
Peak BAC	.073	.090	.120	−.046	−.006	.015
Heavy drinking frequency	5.18	6.39	7.23	−3.55	−1.94	−0.60
RAPI total score	4.20	5.26	6.36	−2.96	−1.83	−0.94

Note. BAC = blood alcohol concentration; RAPI = Rutgers Alcohol Problems Index; AUDIT = Alcohol Use Disorders Identification Test. Estimates for which 95% confidence intervals do not contain zero represent significant relationships between predictor and outcome at the .05 level. Estimates for Readiness-to-Change on Peak BAC and RAPI are significant, even though one of the boundaries is rounded to zero.

^aTabled values are unstandardized regression coefficients relating readiness-to-change (grand-mean centered at 32.06) to drinking outcome.

^bTabled values report expected difference in presanction drinking estimates or presanction to 1-month change comparing individuals scoring 10 or higher on the AUDIT with individuals scoring less than 10.