Display Settings:

Format

Send to:

Choose Destination
See comment in PubMed Commons below
J Clin Epidemiol. 2007 Aug;60(8):787-94. Epub 2007 Mar 26.

Matched-pair study showed higher quality of placebo-controlled trials in Western phytotherapy than conventional medicine.

Author information

  • 1Department of Social and Preventive Medicine, University of Bern, Berne, Switzerland.

Abstract

OBJECTIVES:

Herbal medicine (phytotherapy) is widely used, but the evidence for its effectiveness is a matter of ongoing debate. We compared the quality and results of trials of Western phytotherapy and conventional medicine.

STUDY DESIGN AND SETTING:

A random sample of placebo-controlled trials of Western phytotherapy was identified in a comprehensive literature search (19 electronic databases). Conventional medicine trials matched for condition and type of outcome were selected from the Cochrane Central Controlled Trials Register (issue 1, 2003). Data were extracted in duplicate. Trials described as double-blind, with adequate generation of allocation sequence and adequate concealment of allocation were assumed to be of higher methodological quality.

RESULTS:

Eighty-nine herbal medicine and 89 matched conventional medicine trials were analyzed. Studies of Western herbalism were smaller, less likely to be published in English, and less likely to be indexed in MEDLINE than their counterparts from conventional medicine. Nineteen (21%) herbal and four (5%) conventional medicine trials were of higher quality. In both groups, smaller trials showed more beneficial treatment effects than larger trials.

CONCLUSIONS:

Our findings challenge the widely held belief that the quality of the evidence on the effectiveness of herbal medicine is generally inferior to the evidence available for conventional medicine.

Comment in

PMID:
17606174
[PubMed - indexed for MEDLINE]
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Icon for Elsevier Science
    Loading ...
    Write to the Help Desk