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Table 1 Randomised double blind trials of opioids in chronic non-malignant pain of different aetiology

From: Prevalence of opioid adverse events in chronic non-malignant pain: systematic review of randomised trials of oral opioids

  Number of   Number of
Condition Trials Patients Drug treaments Trial arms Contributing patients
Arthritis 16 2990 Opioid 24 2173
    Placebo 7 445
    Other comparator 2 447
Musculoskeletal 10 1648 Opioid 18 1561
    Placebo 4 302
    Other comparator 0 0
Neuropathic 5 302 Opioid 5 219
    Placebo 4 178
    Other comparator 1 46
Mixed conditions 3 606 Opioid 6 606
    Placebo 1 49
    Other comparator 0 0