Validation and reliability of the German version of the Chronic Pain Grade questionnaire in primary care back pain patients.

Psychosoc Med · 2004 · PMC2736479 · PMID 19742049

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highly significantno p-value reported

Further, the CPG as well as the subscales DS and CPI displayed highly significant relations to the both disability measures FFbH-R and PDI.

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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.