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Using Multivariate Statistics

Attachment--and loss.

Despite a long tradition of effectiveness in laboratory tests, normative messages have had mixed success in changing behavior in field contexts, with some studies showing boomerang effects. To test a theoretical account of this inconsistency, we conducted a field exper- iment in which normative messages were used to promote householdenergyconservation.Aspredicted,adescriptive normative message detailing average neighborhood usage produced either desirable energy savings or the undesir- able boomerang effect, depending on whether households were already consuming at a low or high rate. Also as predicted, adding an injunctive message (conveying social approval or disapproval) eliminated the boomerang effect. The results offer an explanation for the mixed success of persuasive appeals based on social norms and suggest how such appeals should be properly crafted.

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The Constructive, Destructive, and Reconstructive Power of Social Norms

Background Motivational Interviewing is a well-known, scientifically tested method of counselling clients developed by Miller and Rollnick and viewed as a useful intervention strategy in the treatment of lifestyle problems and disease.

Aim To evaluate the effectiveness of motivational interviewing in different areas of disease and to identify factors shaping outcomes.

Design of study A systematic review and meta-analysis of randomised controlled trials using motivational interviewing as the intervention.

Method After selection criteria a systematic literature search in 16 databases produced 72 randomised controlled trials the first of which was published in 1991. A quality assessment was made with a validated scale. A meta-analysis was performed as a generic inverse variance meta-analysis.

Results Meta-analysis showed a significant effect (95% confidence interval) for motivational interviewing for combined effect estimates for body mass index, total blood cholesterol, systolic blood pressure, blood alcohol concentration and standard ethanol content, while combined effect estimates for cigarettes per day and for HbA1c were not significant. Motivational interviewing had a significant and clinically relevant effect in approximately three out of four studies, with an equal effect on physiological (72%) and psychological (75%) diseases. Psychologists and physicians obtained an effect in approximately 80% of the studies, while other healthcare providers obtained an effect in 46% of the studies. When using motivational interviewing in brief encounters of 15 minutes, 64% of the studies showed an effect. More than one encounter with the patient ensures the effectiveness of motivational interviewing.

Conclusion Motivational interviewing in a scientific setting outperforms traditional advice giving in the treatment of a broad range of behavioural problems and diseases. Large-scale studies are now needed to prove that motivational interviewing can be implemented into daily clinical work in primary and secondary health care.

Motivational interviewing: a systematic review and meta-analysis

Quasi-experimentation - design and analysis issues for field settings - cook,td, campbell,dt

Peer influences on college drinking: A review of the research

Objective: Many college students overestimate both the drinking behaviors (descriptive norms) and the approval of drinking (injunctive norms) of their peers. As a result, consistent self-other discrepancies (SODs) have been observed, in which self-perceptions of drinking behaviors and approval of drinking usually are lower than comparable judgments of others. These SODs form the foundation of the currently popular "social norms approach" to alcohol abuse prevention, which conveys to students the actual campus norms regarding drinking behaviors and approval of alcohol use. However, little attention has been paid to the factors that can influence the magnitude of SODs. This research was conducted to address these issues. Method: This meta-analytic integration of 23 studies evaluated the influence of five predictors of SODs: norm type (injunctive or descriptive), gender, reference group, question specificity and campus size. These studies rendered 102 separate tests of SODs in descriptive and injunctive form...

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Descriptive and injunctive norms in college drinking: a meta-analytic integration.

This study consisted of a randomized controlled trial of a 1-session motivational intervention for college student binge drinkers. Sixty students who reported binge drinking 2 or more times in the past 30 days were randomly assigned to either a no-treatment control or a brief intervention group. The intervention provided students with feedback regarding personal consumption, perceived drinking norms, alcohol-related problems, situations associated with heavy drinking, and alcohol expectancies. At 6-week follow-up, the brief intervention group exhibited significant reductions on number of drinks consumed per week, number of times drinking alcohol in the past month, and frequency of binge drinking in the past month. Estimates of typical student drinking mediated these reductions. This study replicates earlier research on the efficacy of brief interventions with college students and extends previous work regarding potential mechanisms of change.

Effects of a brief motivational intervention with college student drinkers.

This study adapted and extended M. L. Cooper's (1994) Drinking Motives Measure to examine marijuana motives among 299 college students. An exploratory factor analysis supported the hypothesized 5-factor marijuana motives model, resulting in enhancement, conformity, expansion, coping, and social motives. Analyses supported the internal consistency and concurrent validity of the 5 marijuana motives. Marijuana motives were significant predictors of marijuana use and added to the prediction of use-related problems above and beyond the contribution of lifetime use. Motives and gender interacted in predicting use and use-related problems. Parallel regression analyses revealed that marijuana and alcohol motives predicted comparable amounts of variance in use and use-related problems. However, different patterns of relations emerged across drugs, supporting the discriminant validity of the marijuana and alcohol motives. Young adults use alcohol and marijuana more often than any other abusable drug. According to the Monitoring the Future study (Johnston, O'Malley, & Bachman, 1994), 94% of adults between the ages of 18 and 29 years have used alcohol in their lifetimes, and 56% have used marijuana. As for recent use, 87% drank alcohol in the last year, and 25% used marijuana. Increases in abuse of both alcohol and marijuana have been observed in recent years (National Institute on Drug Abuse [NIDA] 1996). Also troubling is evidence that the perceived risk of marijuana use has recently decreased among young adults (NIDA, 1996). In light of these trends, increased attention to psychological factors influencing use of these drugs is clearly warranted.

Brian Borsari

Papers

Peer influences on college drinking: A review of the research

Descriptive and injunctive norms in college drinking: a meta-analytic integration.

Effects of a brief motivational intervention with college student drinkers.

Validating a Five-Factor Marijuana Motives Measure: Relations with Use, Problems, and Alcohol Motives.

Predictors of alcohol use during the first year of college : Implications for prevention