Table 3.
Randomized controlled trials of online alcohol interventions: Effect sizes (d) obtained across blood alcohol concentrations and other alcohol-related measures
| Study and Outcome Measure |
Treatment Group (or Treatment Group 1 if More Than One Group) |
Control Group | |||||
| n | Mean (SD) Pre | Mean (SD) Post | n | Mean (SD) Pre | Mean (SD) Post | Pre-Post d | |
| Hustad et al [47] (1) AlcoholEdu, peak BAC | 26 | 0.08 (0.10) |
0.08 (0.09) | 24 | 0.07 (0.08) |
0.15 (0.15) | 0.88 |
| Hustad et al [47] (2) eCHUG, peak BAC | 30 | 0.08 (0.10) |
0.08 (0.08) | 24 | 0.07 (0.08) | 0.15 (0.15) | 0.87 |
| Neighbors et al [44], peak BAC on 21st birthday | 150 | 0.11 (0.10) | 0.10 (0.11) | 145 | 0.12 (0.11) |
0.13 (0.13) | 0.22 |
| Neighbors et al [44], number of drinks on 21st birthday | 150 | 7.23 (5.29) | 6.4 (6.13) | 145 | 7.14 (5.12) | 7.00 (5.57) | 0.13 |
| Bewick et al [49], units per occasion | 138 | a | 6.77 (4.54) | 179 | a | 7.84 (5.78) | 0.23a |
| Doumas and Hannah [39], frequency of drinking to intoxication (ie, number of times drunk or high from alcohol) during the past 30 days | 60 | 1.44(2.06) | 0.85 (1.63) | 73 | 1.19 (1.70) |
1.02 (1.88) | 0.22 |
| Doumas and Hannah [39], peak alcohol consumption (number of drinks consumed on the occasion on which the individual drank the most in the previous month) | 60 | 5.12 (5.36) | 3.55 (3.91) | 73 | 4.15 (4.80) | 3.98 (4.70) | 0.28 |
| Doumas et al [43], peak alcohol consumption (number of drinks consumed on the occasion on which the individual drank the most in the previous month) | 46 | 8.77 (4.53) | 6.95 (3.92) | 31 | 6.21 (2.77) | 5.88 (3.07) | 0.38 |
| Doumas et al [43], drinking to intoxication (ie, number of times drunk or high from alcohol during the past 30 days) | 46 | 0.84 (0.37) |
0.68 (0.47) | 31 | 0.79 (0.41) | 0.71 (0.46) | 0.21 |
| Moore et al [51]b, 30-day frequency of alcohol use | 53 | 4.74 (5.82) | 3.68 (4.95) | 47 | 5.38 (5.83) | 5.02 (4.94) | 0.12 |
| Moore et al [51]b, 30-day quantity of alcohol use (number of drinks per occasion) | 53 | 2.49 (2.55) | 2.53 (2.33) | 47 | 3.15 (2.6) | 2.51 (2.33) | -0.26 |
a Baseline data presented by Bewick et al [49] is not from the posttreatment sample. The pre-post difference is based on the mean differences and related SDs from baseline to posttreatment. Data presented here are not transformed.
b This study’s control group differed primarily in mode of delivery (via postal services) rather than in key content.