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Table 2 Differences in within-group outcomes between baseline and follow-up

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

Variable UC In-person MI Web-MI
Difference (SD) Test stat* d + p Difference (SD) Test stat* d + p Difference (SD) Test stat* d + p
Negative consequences (SIP) 3.82 (8.81) 186.50 0.46 0.013 3.24 (6.10) 233.00 0.29 0.001 3.20 (5.86) 326.50 0.32 <0.0001
Alcohol use # of days 2.63 (19.12) 35.50 0.11 0.474 3.54 (17.49) 66.50 0.12 0.132 4.58 (14.30 126.50 0.19 0.036
# Drinks on typical occasion 0.61 (1.97) 111.50 0.27 0.049 0.82 (2.10) 115.50 0.43 0.014 1.08 (3.33) 143.00 0.33 0.011
Heavy drinking # of days 2.03 (15.46) 40.00 0.16 0.442 1.70 (10.90) 69.50 0.09 0.218 0.61 (13.21) 24.00 0.05 0.742
  1. *  Wilcoxon signed rank test for continuous variables
  2. +Effect size is computed as Cohen’s d: difference/within-group baseline standard deviation