Does targeting manual therapy and/or exercise improve patient outcomes in nonspecific low back pain? A systematic review.

BMC Med · 2010 · PMC2873245 · PMID 20377854

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showed a trendno p-value reported

All studies that showed, or showed a trend towards, statistically significant effect sizes, did so only for short-term outcomes.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.