A comparison of placebo effects in clinical analgesic trials versus studies of placebo analgesia

@article{Vase2002ACO,
  title={A comparison of placebo effects in clinical analgesic trials versus studies of placebo analgesia},
  author={L. Vase and J. Riley and D. Price},
  journal={Pain},
  year={2002},
  volume={99},
  pages={443-452}
}
&NA; A previous meta‐analysis of clinical analgesic trial studies showed generally low magnitudes of placebo analgesia (N. Engl. J. Med. 344 (2001) 1594). However, as studies included in their analysis used only placebo as a control condition, we conducted two meta‐analyses, one in which 23 studies used only placebo as a control condition, and one in which 14 studies investigated placebo analgesic mechanisms. Magnitudes of placebo analgesic effects were much higher in the latter (mean effect… Expand

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