Hip and knee strength is not affected in 12-16 year old adolescents with patellofemoral pain--a cross-sectional population-based study.

PLoS One · 2013 · PMC3827322 · PMID 24236101

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showed a trendno p-value reported

The results showed a trend towards a 3 MET lower physical activity in adolescents with PFP compared to pain-free adolescents.

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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.