|Trial in meta-analysis||Number of trials||Standardised mean difference (95% CI)|
|*All trials were crossover trials. Follow up not reported. CI defined in glossary. A random effects model was used.|
|All trials||12||−0.31 (−0.50 to −0.13)|
|Oral or parenteral opioids||9||−0.40 (−0.63 to −0.17)|
|Nebulised opioids||3||−0.11 (−0.32 to 0.10)†|
Review: oral or parenteral opioids alleviate dyspnoea
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