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Table 4 Baseline and 7-week follow-up alcohol consumption outcomes, comparing intervention groups to controls a

From: Mobile phone brief intervention applications for risky alcohol use among university students: a randomized controlled study

Measures of alcohol consumption in means (SD)

Control

PartyPlanner (n = 153)

PartyPlanner compared to Controlalinear mixed models

Promillekoll (n = 341)

Promillekoll compared to Controlalinear mixed models

Baseline (n = 489)

Follow-up (n = 489)

Baseline

Follow-up

Time x Group p-value

Baseline

Follow-up

Time x Group p-value

Quantity (standard glasses/week)

9.146 (6.178)

8.619 (6.281)

8.570 (6.122)

8.317 (6.449)

0.816

9.617 (6.263)

9.746 (7.053)

0.411

Frequency (drinking occasions/week)

2.288 (1.191)

2.152 (1.192)

2.165 (1.122)

2.171 (1.232)

0.225

2.242 (1.196)

2.362 (1.234)

< 0.001

Binge occasions (no per week)

0.971 (0.852)

0.897 (0.838)

0.880 (0.760)

0.791 (0.822)

0.507

1.082 (0.875)

1.018 (0.837)

0.629

eBACb/week

0.017 (0.015)

0.016 (0.015)

0.016 (0.013)

0.015 (0.016)

0.914

0.017 (0.014)

0.017 (0.018)

0.750

Peak eBACc/month

0.128 (0.082)

0.118 (0.080)

0.126 (0.087)

0.122 (0.096)

0.649

0.108 (0.087)

0.119 (0.084)

0.776

  1. aAnalyses comparing the two intervention groups to controls included only individuals who reported actually using the assigned app. Analyses were controlled for the number of times participants reported using the app, previous use of the publicly available Promillekoll app, and self-reports on having spoken to someone in the past 12 months about their alcohol use.
  2. bEstimated average percentage BAC for the week.
  3. cEstimated average peak percentage BAC during the past month.