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. 2011 Apr 13;2011(4):CD001333. doi: 10.1002/14651858.CD001333.pub4

Summary of findings for the main comparison. naltrexone versus placebo or no pharmacological treatments for opioid dependence.

naltrexone versus placebo or no pharmacological treatments for opioid dependence
Patient or population: patients with opioid dependence 
 Settings:Intervention: naltrexone versus placebo or no pharmacological treatments
Outcomes Illustrative comparative risks* (95% CI) Relative effect 
 (95% CI) No of Participants 
 (studies) Quality of the evidence 
 (GRADE) Comments
Assumed risk Corresponding risk
Control naltrexone versus placebo or no pharmacological treatments
retention and abstinence, all patients Study population RR 1.43 
 (0.72 to 2.82) 393 
 (6 studies)    
168 per 1000 240 per 1000 
 (121 to 474)
Medium risk population
133 per 1000 190 per 1000 
 (96 to 375)
abstinence at follow up Study population RR 1.28 
 (0.8 to 2.05) 116 
 (3 studies)    
340 per 1000 435 per 1000 
 (272 to 697)
Medium risk population
364 per 1000 466 per 1000 
 (291 to 746)
side effects Study population RR 1.29 
 (0.54 to 3.11) 159 
 (4 studies)    
270 per 1000 348 per 1000 
 (146 to 840)
Medium risk population
360 per 1000 464 per 1000 
 (194 to 1000)
*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; RR: Risk ratio;
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.