Responsiveness of the Neck Disability Index in patients with mechanical neck disorders |
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| Authors: | Brian A Young Michael J Walker Joseph B Strunce Robert E Boyles Julie M Whitman John D Childs |
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| Institution: | 1. UOIT-CMCC Centre for the Study of Disability Prevention and Rehabilitation, University of Ontario Institute of Technology (UOIT) and Canadian Memorial Chiropractic College (CMCC), Toronto, ON, Canada;2. Graduate Education and Research Programs, Canadian Memorial Chiropractic College (CMCC), 6100 Leslie Street, Toronto, ON, M2H 3J1, Canada;3. School of Public Health, University of Alberta, 4075 RTF, 8308-114 Street, Edmonton, AB, T6G 2E1, Canada;4. Canada Research Chair in Disability Prevention and Rehabilitation, University of Ontario Institute of Technology (UOIT), 2000 Simcoe Street North, Oshawa, Ontario, L1H 7K4, Canada;5. Faculty of Health Sciences, University of Ontario Institute of Technology (UOIT), 2000 Simcoe Street North, Oshawa, Ontario, L1H 7K4, Canada;6. UOIT-CMCC Centre for the Study of Disability Prevention and Rehabilitation, 6100 Leslie St., Toronto, Ontario, M2H 3J1, Canada;7. Division of Undergraduate Education, Canadian Memorial Chiropractic College, 6100 Leslie St., Toronto, Ontario, M2H 3J1, Canada;8. Toronto Health Economics and Technology Assessment (THETA) Collaborative, Leslie Dan Pharmacy Building, University of Toronto, 6th Floor, Room 658, 144 College Street, Toronto, Ontario, M5S 3M2, Canada;9. Leslie Dan Faculty of Pharmacy, University of Toronto, 144 College Street, Toronto, Ontario, M5S 3M2, Canada;10. Institute for Work and Health, 481 University Ave, Toronto, Ontario, M5G 2E9, Canada;11. Department of Orthopedic Surgery, Occupational and Industrial Orthopedic Center, NYU School of Medicine, New York University, 63 Downing Street, New York, 10014, USA;1. Department of Orthopaedic Surgery, Vanderbilt University Medical Center, Nashville, TN, USA;2. Vanderbilt Center for Musculoskeletal Research, Vanderbilt University Medical Center, Nashville, TN, USA;3. Department of Neurological Surgery, Vanderbilt University Medical Center, Nashville, TN, USA;4. Department of Neurological Surgery, Mayo Clinic, Rochester, MN, USA;5. Carolina Neurosurgery & Spine Associates, Carolinas Healthcare System, Charlotte, NC, USA;6. Steamboat Orthopaedic and Spine Institute, Steamboat Springs, CO, USA;7. Department of Physical Medicine & Rehabilitation, Vanderbilt University Medical Center, Nashville, TN, USA |
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| Abstract: | PurposeReport the test-retest reliability, construct validity, minimum clinically important difference (MCID), and minimal detectable change (MDC) for the Neck Disability Index (NDI).Study design/settingCohort study of patients presenting to outpatient physical therapy clinics.Patient sampleNinety-one subjects with a primary complaint of neck pain, with or without concomitant upper extremity (UE) symptoms, who were participants in a randomized clinical trial.Outcome MeasuresNDI and the 15-point Global Rating of Change (GRC) self-report measures.MethodsAll subjects completed the NDI at baseline and at a 3-week follow-up. Additionally, subjects completed the GRC scale, which was used to dichotomize patients into improved or stable groups. Changes in the NDI were used to assess test-retest reliability, construct validity, MCID, and MDC.ResultsTest-retest reliability was moderate for the NDI (intraclass correlation coefficient, 0.64; 95% confidence interval, 0.19–0.84). For the NDI, the MCID was 7.5 points and the MDC was 10.2 points.ConclusionsThe NDI appears to demonstrate adequate responsiveness based on statistical reference criteria when used in a sample that approximates the high percentage of patients with neck pain and concomitant UE referred symptoms. Because the MCID is within the bounds of measurement error, a 10-point change (the MDC) should be used as the MCID. |
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