The literature search retrieved 160 records. Ten trials, involving a total of 967 participants, were included in the review and eight of these were included in the meta-analysis. Participants’ mean age ranged 44–48 years. Eight studies had low risk of bias and two studies had high risk of bias. Meta-analyses revealed strong evidence for short-term effects of yoga on pain (SMD=−0.48; 95% CI −0.65 to −0.31; p<0.01) and back-specific disability (SMD=−0.59; 95% CI −0.87 to −0.30; p<0.01) compared with controls. At long-term follow-up, there was moderate evidence for reduction of pain (SMD=−0.33; 95% CI −0.59 to −0.07; p=0.01) and back-specific disability (SMD=−0.35; 95% CI −0.55 to −0.15; p<0.01). There was no evidence for either short-term or long-term effects on quality of life. The short-term effect on back-specific disability was of moderate size but all other effects were judged small.
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