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J Manipulative Physiol Ther. 2011 Jun;34(5):297-305. doi: 10.1016/j.jmpt.2011.04.007. Epub 2011 May 19.

Headache: the placebo effects in the control groups in randomized clinical trials; an analysis of systematic reviews.

Author information

1
Department of General Practice, Erasmus Medical Center, Rotterdam, The Netherlands.

Abstract

OBJECTIVE:

The purpose of this study is to describe the effects in the placebo and "no treatment" arms in trials with headache patients.

METHOD:

This is a secondary analysis of randomized controlled trials from 8 systematic reviews and selected trials with a "no treatment" or placebo control group. The different types of "no treatment" and placebo interventions were assessed and classified into 6 subgroups. The analyses were carried out according to type of outcome variable.

RESULTS:

In total, 119 studies were included (7119 participants). The mean recovery rate in all control groups was 35.7%. Significantly more participants recovered in control groups of pharmacological studies than in nonpharmacological studies: 38.5% vs 15.0%, respectively. Adults were more likely to recover in nonpharmacological studies and children in pharmacological studies.

CONCLUSIONS:

The mean recovery rate in the control groups was 36%. The recovery rate varied substantially between type of intervention and patients.

PMID:
21640253
DOI:
10.1016/j.jmpt.2011.04.007
[Indexed for MEDLINE]

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