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"Three brief comments on the excellent BEAM Trial.
My reading of the results is that the data are compatible with a non-specific effect caused by touch: exercise has a significantly positive effect on back pain which can be enhanced by touch. If this "devil's advocate" view is correct, the effects have little to do with spinal manipulation per se.
It would be relevant to know which of the three professional groups (chiropractors, osteopaths, physiotherapists) generated the largest effect size. This might significantly influence the referral pattern. A post-hoc analysis might answer this question.
It is regrettable that the study only monitored serious adverse effects. There is compelling data to demonstrate that minor adverse effects occur in about 50% of patients after spinal manipulation. If that is the case, such adverse events might also influence GP's referrals."
Professor Edzard Ernst, Director, Complementary Medicine, Peninsula Medical School, Exeter, UK. (British Medical Journal, 6th December 2004) [Full text available via free registration]