Arthritis Research & Therapy Volume 9 Issue 2

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Cause vs effect...

Gershom Lundberg   (11 April 2007)  Crawford and Lundberg X-Ray Clinic

Unless I misunderstand the structure of this research, there is no random assignment of participants to active vs inactive groups.

Therefore, it is unjustified to conclude that exercise is beneficial. It may simply be that women with arthritis pain are less active, BECAUSE they are in pain.

Competing interests

none

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