![Intel-correlation and Test-Retest Reliability of the Pain Disability Index (PDI) and the Oswestry Disability Questionnaire (ODQ) and Their Correlation with Pain Intensity in Low Back Pain Patients]()
Intel-correlation and Test-Retest Reliability of the Pain Disability Index (PDI) and the Oswestry Disability Questionnaire (ODQ) and Their Correlation with Pain Intensity in Low Back Pain PatientsGrönblad, Mats; Hupli, Markku; Wennerstrand, Pekka; Järvinen, Erkki; Lukinmaa, Asko; Kouri, Jukka-Pekka; Karaharju, Erkki O. · The Clinical Journal of Pain · 1993