A pilot study comparing in-person and web-based motivational interviewing among adults with a first-time DUI offense

Table 3 Intervention effect estimates of outcomes compared to usual care at 3 months post-baseline

Outcome	Estimate	Confidence interval		t statistic (132 df)	p value	d*
Negative consequences (SIP)
Web-MI	1.13	−1.42	3.69	0.88	0.382	0.12
In-person MI	1.13	−1.47	3.72	0.86	0.392	0.12
Alcohol use # of days
Web-MI	0.03	−6.15	6.20	0.01	0.993	0.00
In-person MI	0.48	−5.79	6.75	0.15	0.880	0.04
# Drinks on typical occasion
Web-MI	0.00	−0.81	0.81	0.00	0.998	0.00
In-person MI	−0.01	−0.82	0.81	−0.01	0.988	0.00
Heavy drinking # of days
Web-MI	1.29	−3.31	5.90	0.56	0.580	0.08
In-person MI	1.20	−3.47	5.87	0.51	0.612	0.09

	Log-odds ratio	Confidence interval		t statistic (132 df)	p value	Odds ratio
Drink and drive past 3 months
Web-MI	−1.39	−12.78	10.00	−0.24	0.810	0.25
In-person MI	−1.99	−13.43	9.46	−0.34	0.732	0.14

* Cohen’s d = estimate/pooled standard deviation across the two comparison conditions

ISSN: 1940-0640