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. 2011 May 11;2011(5):CD008063. doi: 10.1002/14651858.CD008063.pub2

Summary of findings 4. motivational interviewing compared to other active intervention for substance abuse.

motivational interviewing compared to other active intervention for substance abuse
Patient or population: patients with substance abuse 
 Settings:Intervention: motivational interviewing 
 Comparison: other active intervention
Outcomes Illustrative comparative risks* (95% CI) Relative effect 
 (95% CI) No of Participants 
 (studies) Quality of the evidence 
 (GRADE) Comments
Assumed risk Corresponding risk
other active intervention motivational interviewing
amount of substance abuse post intervention   The mean amount of substance abuse post intervention in the intervention groups was 
 0.07 standard deviations higher 
 (0.37 lower to 0.23 higher)   185 
 (2 studies) ⊕⊕⊝⊝ 
 low1  
amount of substance abuse short follow‐up 
 Follow‐up: 1‐6 months   The mean amount of substance abuse short follow‐up in the intervention groups was 
 0.02 standard deviations lower 
 (0.07 lower to 0.12 higher)   2137 
 (12 studies) ⊕⊕⊕⊝ 
 moderate2  
amount of substance abuse medium follow‐up 
 Follow‐up: 6‐12 months   The mean amount of substance abuse medium follow‐up in the intervention groups was 
 0.02 standard deviations higher 
 (0.16 lower to 0.13 higher)   1586 
 (6 studies) ⊕⊕⊕⊝ 
 moderate2  
amount of substance abuse long follow‐up 
 Follow‐up: median 12 months   The mean amount of substance abuse long follow‐up in the intervention groups was 
 0.03 standard deviations higher 
 (0.21 lower to 0.14 higher)   437 
 (2 studies) ⊕⊕⊝⊝ 
 low1,2  
Retention 
 Follow‐up: 0‐6 months   The mean Retention in the intervention groups was 
 0.01 standard deviations higher 
 (0.45 lower to 0.47 higher)   447 
 (5 studies) ⊕⊕⊝⊝ 
 low2,3,4  
Readiness for change   The mean Readiness for change in the intervention groups was 
 0.03 standard deviations higher 
 (0.24 lower to 0.18 higher)   350 
 (2 studies) ⊕⊕⊝⊝ 
 low1,5  
*The basis for the assumed risk (e.g. the median control group risk across studies) is provided in footnotes. The corresponding risk (and its 95% confidence interval) is based on the assumed risk in the comparison group and the relative effect of the intervention (and its 95% CI). 
 CI: Confidence interval;
GRADE Working Group grades of evidence 
 High quality: Further research is very unlikely to change our confidence in the estimate of effect. 
 Moderate quality: Further research is likely to have an important impact on our confidence in the estimate of effect and may change the estimate. 
 Low quality: Further research is very likely to have an important impact on our confidence in the estimate of effect and is likely to change the estimate. 
 Very low quality: We are very uncertain about the estimate.

1 Unclear randomisation and blinding of assessor. 
 2 Unclear randomisation. 
 3 I‐squared = 29%. 
 4 Wide confidence interval. 
 5 Wide confidence interval.