Table 1.

Changes in drinking at follow-up as a function of intervention conditions

Predictor	B	χ2obs	Incident risk/odds ratio	[95% CI]
Zero inflation
Intercept	-3.430	5.40*	–	–
Baseline DDQ	0.091	0.45	1.10	[0.84, 1.43]
Descriptive	2.048	1.80	7.57	[0.39, 154.4]
Descript + Injunct	0.208	0.01	1.23	[0.04, 36.41]
Descriptive × Baseline DDQ	-0.302	2.51	0.74	[0.51, 1.07]
Descript + Injunct × Baseline DDQ	-0.100	0.32	0.91	[0.64, 1.28]
Negative binomial
Intercept	1.518	246.81**	–	–
Baseline DDQ	0.082	29.65**	1.08	[1.05, 1.12]
Descriptive	-0.056	0.01	0.95	[0.74, 1.31]
Descript + Injunct	0.160	1.39	1.17	[0.90, 1.53]
Descriptive × Baseline DDQ	-0.034	4.19*	0.97	[0.94, 0.99]
Descrip + Injunct × Baseline DDQ	-0.023	1.49	0.98	[0.94, 1.01]

Notes: Dummy-coded vectors were created for Descriptive and Descript + Injunct. N = 165. Descript + Injunct = descriptive plus injunctive condition; CI = confidence interval; DDQ = Daily Drinking Questionnaire.

^*p < .05;

^**p < .01.