The association between obesity and back pain in nine countries: a cross-sectional study.

BMC Public Health · 2015 · PMC4331391 · PMID 25886589

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an increasing trendno p-value reported

Previous studies have reported an increasing trend with age or a decrease after age 65 years [ 3 , 30 ].

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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.