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

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

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