title: Neck Pain and Disability Scale and the Neck Disability Index: reproducibility of the Dutch Language Versions.
abstract: The first aim of this study was to translate the Neck Pain and Disability Scale (NPAD) from English into Dutch producing the NPAD-Dutch Language Version (DLV). The second aim was to analyze test-retest reliability and agreement of the NPAD-DLV and the Neck Disability Index (NDI)-DLV. The NPAD was translated according to established guidelines. Thirty-four patients (mean age 37.5 years, 68% female) with chronic neck pain (CNP), within an outpatient rehabilitation setting, participated in this study. The NPAD-DLV and the NDI-DLV were filled out twice with a mean test-retest interval of 18 days. The intraclass correlation coefficient of the NPAD-DLV was 0.76 (95% confidence interval (CI) 0.57-0.87) and of the NDI-DLV 0.84 (95% CI 0.69-0.92). The limits of agreement of the NPAD-DLV and the NDI-DLV were, respectively, ±20.9 (scale 0-100) and ±6.5 (scale 0-50). The reliability of the NPAD-DLV and the NDI-DLV was acceptable for patients with CNP. The variation ('instability') in the NPAD-DLV total scores was relatively large and larger than the variation of the NDI-DLV.
authors.affiliation: Center for Rehabilitation, University Medical Center Groningen, University of Groningen, PO Box 30 002, 9750 RA Haren, Groningen, The Netherlands. w.jorritsma@cvr.umcg.nl
authors.forename: Wim
authors.initials: W
authors.lastname: Jorritsma
authors.forename: Grietje E
authors.initials: GE
authors.lastname: de Vries
authors.forename: Jan H B
authors.initials: JH
authors.lastname: Geertzen
authors.forename: Pieter U
authors.initials: PU
authors.lastname: Dijkstra
authors.forename: Michiel F
authors.initials: MF
authors.lastname: Reneman
mesh_terms: D000328:Adult; D002908:Chronic Disease; D004185:Disability Evaluation; D005260:Female; D006801:Humans; D007802:Language; D008297:Male; D008875:Middle Aged; D019547:Neck Pain / Q000175:diagnosis* / Q000503:physiopathology / Q000534:rehabilitation; D009426:Netherlands; D010147:Pain Measurement / Q000379:methods*; D011237:Predictive Value of Tests; D011795:Surveys and Questionnaires / Q000592:standards*; D014175:Translating; D055815:Young Adult