Edinburgh Napier University

  Aims
To test the effectiveness of a theoretically-based text message intervention to reduce binge drinking among socially disadvantaged men.
Design
A multi-centre parallel group, pragmatic, individually randomised controlled trial.
Setting
Community based study conducted in four regions of Scotland.
Participants
825 men aged 25-44 years recruited from socially disadvantaged areas who had ≥2 episodes of binge drinking (>8 UK units on a single occasion) in the preceding 28 days: 411 men were randomised to the intervention and 414 to the control.
Intervention and comparator
A series of 112 interactive text messages was delivered by mobile phone over a 12 week period. The intervention was structured around the Health Action Process Approach, a comprehensive model which allows integration of a range of evidence based behaviour change techniques. The control group received 89 texts on general health, with no mention of alcohol or use of behaviour change techniques.
Measurements
The primary outcome measure was the proportion of men consuming >8 units on ≥3 occasions (in the previous 28 days) at 12 months post-intervention.
Findings
The proportion of men consuming >8 units on ≥3 occasions (in the previous 28 days) was 41.5% in the intervention group and 47.8% in the control group. Formal analysis showed that there was no evidence that the intervention was effective (odds ratio 0.79, 95% CI 0.57 to 1.08; absolute reduction 5.7%, 95% CI -13.3 to 1.9). The Bayes factor for this outcome was 1.3, confirming that the results were inconclusive. The retention was high and similar in intervention (84.9%) and control (86.5%) groups. Most men in the intervention group engaged with the text messages: almost all (92%) replied to text messages and 67% replied more than 10 times.
Conclusions
A theoretically based text messaging intervention aimed at reducing binge drinking in disadvantaged men was not found to reduce prevalence of binge drinking at 12 month follow-up.