German version of the whiplash disability questionnaire: reproducibility and responsiveness.

Publisher: BioMed Central Country of Publication: England NLM ID: 101153626 Publication Model: Electronic Cited Medium: Internet ISSN: 1477-7525 (Electronic) Linking ISSN: 14777525 NLM ISO Abbreviation: Health Qual Life Outcomes Subsets: MEDLINE

Original Publication: [London] : BioMed Central, c2003-

Disability Evaluation* ; Outcome and Process Assessment, Health Care* ; Quality of Life*; Disabled Persons/*psychology ; Surveys and Questionnaires/*standards ; Whiplash Injuries/*diagnosis; Adult ; Female ; Germany ; Humans ; Language ; Male ; Middle Aged ; Psychometrics/methods ; ROC Curve ; Reproducibility of Results ; Switzerland ; Whiplash Injuries/physiopathology ; Whiplash Injuries/rehabilitation

Background: The Whiplash Disability Questionnaire (WDQ) poses a validated tool for the assessment of patients who experience whiplash-associated disorders. A German translation and cross-cultural adaptation was recently produced and presented high validity and internal consistency. As a follow-up, the presented study tests the translated Whiplash Disability Questionnaire's (WDQ-G) retest reliability and responsiveness to change.
Methods: The WDQ-G was assessed on three different measurement events: first upon entry (ME1), second four days after entry (ME2), and third at discharge (ME3). Test-retest reliability data from ME1 and ME2 was analysed in a group of stable patients to obtain the intraclass correlation coefficient (ICC) and the standard error of measurement (SEM). To test the instrument's responsiveness, WDQ-G change data were compared to concurrent instruments. The probability of each instrument, to correctly distinguish patients of the stable phase (ME1 to ME2) from patients who deemed to have improved between from ME1 to ME3, was analysed.
Results: In total, 53 patients (35 females, age=45 ± 12.2) were recruited. WDQ-G scores changed from ME1 to ME2 by 5.41 ± 11.6 points in a stable group. This corresponds to a test-retest reliability of ICC=0.91 (95% CI=0.80-0.95) with a SEM of 6.14 points. Minimal Detectable Change, at 95% confidence, was calculated to be 17 points change in scores. Area under Receiver Operator Characteristics of the WDQ-G's responsiveness revealed a probability of 84.6% (95% CI=76.2%-93%) to correctly distinguish between improved and stable patients. Optimal sensitivity (73.2%) and specificity (76.2%) was established at 11-point change.
Conclusions: High retest reliability and good responsiveness of the WDQ-G support clinical implementation of the translated version. The data suggest, that change in total score greater than eleven points can be interpreted as clinical relevant from a patient's perspective. Minimal Important Change is suggested at 15 points where there is still high specificity and a 90% confidence MDC.

Pain. 1992 Aug;50(2):133-149. (PMID: 1408309)
Pain. 2003 Apr;102(3):273-281. (PMID: 12670669)
Spine (Phila Pa 1976). 2004 Dec 15;29(24):2851-5. (PMID: 15599289)
J Rheumatol. 2006 Apr;33(4):764-70. (PMID: 16583479)
BMJ. 1994 Jun 11;308(6943):1552. (PMID: 8019315)
J Chronic Dis. 1987;40(2):171-8. (PMID: 3818871)
Z Orthop Ihre Grenzgeb. 2000 Sep-Oct;138(5):447-51. (PMID: 11084747)
Spine (Phila Pa 1976). 2004 Feb 1;29(3):263-8. (PMID: 14752347)
Z Orthop Ihre Grenzgeb. 1999 Sep-Oct;137(5):437-41. (PMID: 10549122)
Soc Sci Med. 1995 Nov;41(10):1359-66. (PMID: 8560303)
Pain. 1987 May;29(2):195-207. (PMID: 2886967)
Ann Emerg Med. 2001 Dec;38(6):633-8. (PMID: 11719741)
Pain. 2004 Aug;110(3):681-688. (PMID: 15288409)
Arthritis Care Res. 1995 Sep;8(3):174-81. (PMID: 7654802)
J Rheumatol. 1997 Aug;24(8):1608-14. (PMID: 9263159)
Spine J. 2010 Jun;10(6):507-9. (PMID: 20494811)
Health Qual Life Outcomes. 2013 Mar 14;11:45. (PMID: 23497358)
Health Qual Life Outcomes. 2006 Aug 22;4:54. (PMID: 16925807)
Spine J. 2010 Jun;10(6):469-74. (PMID: 20359958)
J Clin Epidemiol. 1998 Nov;51(11):903-12. (PMID: 9817107)
J Clin Epidemiol. 1998 Nov;51(11):913-23. (PMID: 9817108)
Spine (Phila Pa 1976). 1995 Apr 15;20(8 Suppl):1S-73S. (PMID: 7604354)
J Clin Epidemiol. 2010 Jan;63(1):37-45. (PMID: 19540720)
J Clin Epidemiol. 2000 May;53(5):459-68. (PMID: 10812317)
J Neurosurg Spine. 2011 May;14(5):598-604. (PMID: 21332281)
J Clin Epidemiol. 2003 May;56(5):395-407. (PMID: 12812812)
Ann Rheum Dis. 2001 Sep;60(9):834-40. (PMID: 11502609)
Clin Rehabil. 2012 Feb;26(2):142-51. (PMID: 21856722)
J Consult Clin Psychol. 1992 Jun;60(3):402-8. (PMID: 1619094)
Med Care. 1990 Jul;28(7):632-42. (PMID: 2366602)
Spine (Phila Pa 1976). 2008 Feb 15;33(4 Suppl):S199-213. (PMID: 18204393)

Date Created: 20130319 Date Completed: 20130701 Latest Revision: 20240506

20240506

PMC3736610

10.1186/1477-7525-11-36

23497054