"The research on chiropractic has been far from rigorous. One of the
problems is that studies of spinal manipulation therapy (SMT) can’t be
double blinded, and it is very difficult to even do single blinding. So
most studies resort to non-manipulation control groups like “usual care”
or “wait list” or “pain medication.” Those studies are practically
guaranteed to lead to false positive conclusions: they make SMT look
more effective than it would look if you could provide a control that
patients couldn’t distinguish from real SMT."
A Credible Placebo Control for Chiropractic Research
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