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An Intervention to Reduce Alcohol Consumption in Undergraduate Students Using Implementation Intentions and Mental Simulations: A Cross-National Study

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Abstract

Background

Excessive alcohol consumption has been linked to deleterious health consequences among undergraduate students. There is a need to develop theory-based and cost-effective brief interventions to attenuate alcohol consumption in this population.

Purpose

The present study tested the effectiveness of an integrated theory-based intervention in reducing undergraduates' alcohol consumption in excess of guideline limits in national samples from Estonia, Finland, and the UK.

Method

A 2 (volitional: implementation intention vs. no implementation intention) × 2 (motivation: mental simulation vs. no mental simulation) × 3 (nationality: Estonia vs. Finland vs. UK) randomized-controlled design was adopted. Participants completed baseline psychological measures and self-reported number of alcohol units consumed and binge-drinking frequency followed by the intervention manipulation. One month later, participants completed follow-up measures of the psychological variables and alcohol consumption.

Results

Results revealed main effects for implementation intention and nationality on units of alcohol consumed at follow-up and an implementation intention × nationality interaction. Alcohol consumption was significantly reduced in the implementation intention condition for the Estonian and UK samples. There was a significant main effect for nationality and an implementation intention × nationality interaction on binge-drinking frequency. Follow-up tests revealed significant reductions in binge-drinking occasions in the implementation intention group for the UK sample only.

Conclusion

Results support the implementation intention component of the intervention in reducing alcohol drinking in excess of guideline limits among Estonian and UK undergraduates. There was no support for the motivational intervention or the interaction between the strategies. Results are discussed with respect to intervention design based on motivational and volitional approaches.

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Notes

  1. The measure of motivation correlated significantly with the Theory of Planned Behaviour variables. Correlations between motivation and intention were particularly strong (r range = 0.65 to 0.80), an unsurprising finding given that intention is a motivational variable and reflects the degree of planning and effort an individual is prepared to invest in pursuing the behavior in the future. Taking into consideration the strength of these relations, we exercised care not to include intentions and motivation together as covariates in subsequent analyses in order to avoid potential problems of multi-colinearity.

  2. Previous intervention studies have shown that the significant effects of implementation intention and planning manipulations on alcohol consumption are confined to female samples [41]. This differential effectiveness was a concern in the present study given the variation in gender profiles across the three national samples. One possibility was that the higher proportion of female participants in the UK sample and, to a lesser extent, the Estonian sample, may have accounted for the significant findings for the implementation intention manipulation on the alcohol behavior variables in these samples, relative to the Finnish sample which had the closest ratio of males to females and showed no effects. As a consequence, we conducted supplementary ANCOVAs with gender as an additional independent factor to test the hypothesis that gender moderated the effect of the interventions. Specifically, we conducted two 2 (implementation intention: present vs. absent) × 2 (mental simulation: present vs. absent) × 3 (nationality: Estonia vs. Finland vs. UK) × 2 (gender: male vs. female) ANCOVAs on the dependent variables of average number of units of alcohol and number of binge-drinking occasions in the month following the intervention. The analyses revealed an identical pattern of effects as the main analyses. Specifically, the analysis with number of units consumed as the dependent variable revealed significant main effects for implementation intentions (F(1, 440) = 6.36, p < 0.05, η 2p  = 0.01) and nationality (F(2, 440) = 5.42, p < 0.01, η 2p  = 0.02), and a significant implementation intention × nationality interaction (F(2, 440) = 5.73, p < 0.01, η 2p  = 0.03). The analysis with number of binge-drinking occasions as the dependent variable revealed a significant main effect for nationality (F(1, 440) = 3.60, p < 0.05, η 2p  = 0.02) and a significant implementation intention × nationality interaction effect (F(2, 440) = 4.26, p < 0.05, η 2p  = 0.02). In both analyses, there was no significant main effect for gender or any effect of the two-, three-, or four-way interactions between gender and the other independent variables on alcohol behavior. These data led us to reject the hypothesis that gender moderated the effects of the intervention components, specifically, implementation intentions, on alcohol behavior.

  3. We also tested whether the inclusion of participants who consumed no alcohol at baseline affected results. Specifically, we conducted analyses on participants reporting drinking at least 1 U of alcohol in the previous 4 weeks at baseline. We conducted two additional 2 (implementation intention: present vs. absent) × 2 (mental simulation: present vs. absent) × 3 (nationality: Estonia vs. Finland vs. UK) ANCOVAs with number of units of alcohol consumed and number of binge-drinking occasions as dependent variables and controlling for baseline FAST scores, alcohol consumption, and attitudes. For the analysis with number of units consumed as the dependent variable, the analysis revealed significant main effects for implementation intention (F(1, 399) = 3.72, p < 0.05, η 2p  = 0.01) and nationality (F(2, 399) = 8.21, p < 0.01, η 2p  = 0.04), and a significant two-way interaction for implementation intentions and nationality (F(2, 399) = 3.19, p < 0.05, η 2p  = 0.02). This interaction was probed with separate univariate ANCOVAs for each national group. The analyses revealed significant main effects for implementation intentions in the Estonia (F(1, 155) = 4.41, p < 0.05, η 2p  = 0.03), and UK (F(1, 158) = 10.58, p < 0.01, η 2p  = 0.07) samples. For the analysis with number of binge-drinking occasions as the dependent variable, a significant main effect for nationality (F(1, 399) = 6.01, p < 0.01, η 2p  = 0.03) and a significant two-way interaction for implementation intentions and nationality (F(2, 399) = 4.27, p < 0.05, η 2p  = 0.02) was found. Separate univariate ANCOVAs revealed a similar main effect for implementation intentions as that found previously for the UK sample (F(1, 158) = 6.50, p < 0.05, η 2p  = 0.04). There were no other significant effects. These results, therefore, follow a similar pattern to those found in the overall sample.

  4. Mean levels of intentions were significantly higher than the midpoint of the six-point scale for the Estonian (M = 4.74, SD = 1.19; t(1,184) = 14.19, p < 0.01, d = 2.09), Finnish (M = 4.03, SD = 1.73; t(1,118) = 3.37, p < 0.01, d = 0.62), and UK samples (M = 3.96, SD = 1.33; t(1,162) = 4.42, p < 0.01, d = 0.69).

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Correspondence to Martin S. Hagger.

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This research was supported by grant #EA 07 10 from the European Research Advisory Board awarded to Martin S. Hagger.

Appendix 1

Appendix 1

Introductory Passage

Initial introductory passage provided to participants allocated to the implementation intention and mental simulation conditions:

“The World Health Organization (WHO) recommends that safe limits for drinking alcoholic drinks are 4 U per day for men and 3 U per day for women. Drinking above these safe limits could lead to some health conditions in the long run. Considering these health messages, we would like you to try to keep your regular alcohol intake so that it is within recommended limits on each individual occasion or session over the next month. To help you do this, we ask you to take 5 min of your time to complete the next very simple mental exercise(s)”.

Implementation Intention Manipulation

“You are more likely to carry out your intention to keep your alcohol intake to within safe limits on each occasion or session if you make a decision about the time and place you will do so and how you plan to do it. Decide now when and where you will need to keep your alcohol intake to within safe limits and how you will do it. We want you to plan to keep your alcohol drinking to within safe limits on each occasion or session over the next month, paying particular attention to the specific situations in which you will implement these plans. For example, you may find it useful to say to yourself, ‘If I am in a bar/pub drinking with my friends and I am likely to drink over the daily safe limits for alcohol, then I will opt for a soft drink instead of an alcoholic drink to keep within the recommended safe limits.’ Please write your plans on the lines below, following the format shown in the previous example (‘if… then…’).”

Mental Simulation Manipulation

“You are now asked to visualize yourself having achieved your goal of keeping your alcohol intake to within safe limits on each individual occasion or session over the next month, and imagine how you would feel. Imagine how much effort and willpower it has taken to achieve your goal of keeping your alcohol intake to within safe limits on each occasion or session and that you have successfully managed to do it. Imagine how satisfied you will feel. It is very important that you see yourself actually keeping your alcohol intake to within safe limits on each occasion or session over the next month and keep that picture on your mind. Please write on the lines below how you imagine will feel if you achieve your goal of keeping your alcohol intake within safe limits on each individual occasion or session over the next month.”

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Hagger, M.S., Lonsdale, A., Koka, A. et al. An Intervention to Reduce Alcohol Consumption in Undergraduate Students Using Implementation Intentions and Mental Simulations: A Cross-National Study. Int.J. Behav. Med. 19, 82–96 (2012). https://doi.org/10.1007/s12529-011-9163-8

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