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2,251 potential cases

Cases (n) exclusion (n) Controls. 2,251 potential cases. 2,780 potential controls. exclusion: trauma related 1. exclusion: age 2. 568. 952. exclusion: OA <°III.

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2,251 potential cases

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  1. Cases (n) exclusion (n) Controls 2,251 potential cases 2,780 potential controls exclusion: trauma related1 exclusion: age2 568 952 exclusion: OA <°III exclusion: external cause3 147 331 1,536 addressed knee OA patients 1,497 addressed trauma patients no contact possible 104 88 patient refused participation 254 353 wrong address 43 23 patient died 13 1 excluded due to general health status 64 45 excluded due to linguistic/cognitive disability 113 122 insufficient fulfilment of questionnaire 14 22 exclusion: OA > 10 years exclusion: suspicion of OA 78 226 exclusion: OA trauma related exclusion: other 146 14 1 Exclusion because knee OA was caused by an accident or because place of residence of patient was not in the vicinity of the participating hospitals. 2 Exclusion because corresponding age group in cases was full. 3 Exclusion because treatment due to an external cause or work-related. 739 recruited knee OA patients 571 recruited trauma patients

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