Data from: Placebo effects in trials evaluating 12 selected minimally invasive interventions: a systematic review and meta-analysis

Holtedahl R, Brox JI, Tjomsland O

Date Published: December 24, 2014

DOI: http://dx.doi.org/10.5061/dryad.105cb

 

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Title Effect sizes
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Description The spreadsheet includes standard deviations (in some cases converted from SE or confidence interval) at baseline and at last follow-up, both in active treatment and sham group in the included 21 trials. Cohen's effect size (standardised mean difference between baseline and last follow-up) was calculated for primary and pooled secondary endpoints. The values were adjusted for variable number of participants (see ref. 14).
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When using this data, please cite the original publication:

Holtedahl R, Brox JI, Tjomsland O (2015) Placebo effects in trials evaluating 12 selected minimally invasive interventions: a systematic review and meta-analysis. BMJ Open 5: e007331. http://dx.doi.org/10.1136/bmjopen-2014-007331

Additionally, please cite the Dryad data package:

Holtedahl R, Brox JI, Tjomsland O (2015) Data from: Placebo effects in trials evaluating 12 selected minimally invasive interventions: a systematic review and meta-analysis. Dryad Digital Repository. http://dx.doi.org/10.5061/dryad.105cb
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