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Methods From September-December 2011, we conducted a 12week RCT comparing once vs. twice-weekly standardized 75-minute hatha yoga classes for 95 adults with nonspecific CLBP. Recruitment and classes occurred in a large safety-net hospital and five affiliated community health centers in Boston, Massachusetts. Primary outcomes were mean low back pain intensity in the previous week (0-10) and back-related function (Modified Roland-Morris Disability, MRMD, 0-23). We used twosample t-tests to compare once/week vs. twice/week mean change scores (baseline-12 weeks) for pain and MRMD. Analyses used the intention-to-treat principle.

bmc complementary and alternative medicine

OA10.01. The Yoga Dosing Study: comparing once vs. twice per week yoga classes for chronic low back pain in predominantly low income minority populations