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Urdu version of the neck disability index: a reliability and validity study
Muhammad Nazim Farooq1,2, Mohammad A Mohseni-Bandpei3,4, Syed Amir Gilani5
1University Institute of Physical Therapy, Faculty of Allied Health Sciences, University of Lahore, Lahore, Pakistan.
BMC Musculoskeletal Disorders
|April 9, 2017
Summary
The Urdu Neck Disability Index (NDI-U) is now available for assessing chronic mechanical neck pain (CMNP) in Urdu-speaking patients. This validated tool demonstrates excellent reliability and responsiveness for measuring disability.
Area of Science:
- Rehabilitation Medicine
- Health Outcomes Measurement
- Cross-Cultural Adaptation of Instruments
Background:
- The Neck Disability Index (NDI) is widely used for neck pain assessment but lacks an Urdu translation.
- Urdu-speaking populations with chronic mechanical neck pain (CMNP) have limited access to validated NDI tools.
Purpose of the Study:
- To translate and cross-culturally adapt the NDI into Urdu, creating the NDI-U.
- To evaluate the reliability, validity, and responsiveness of the NDI-U in Urdu-speaking patients with CMNP.
Main Methods:
- The NDI was translated and adapted to Urdu (NDI-U).
- Seventy-six CMNP patients and 30 healthy controls completed the NDI-U and Visual Analogue Scales (VAS).
- Reliability, validity (content, construct, discriminative, convergent), and responsiveness were assessed using statistical analyses.
Main Results:
- The NDI-U demonstrated excellent test-retest reliability (ICC=0.99) and internal consistency (Cronbach's alpha=0.90).
- The NDI-U showed good content validity, significant discriminative validity (P<0.001), and strong convergent validity with VAS disability (r=0.83).
- The NDI-U was responsive to change, with significant differences between stable and improved groups (P<0.001).
Conclusions:
- The Urdu Neck Disability Index (NDI-U) is a reliable, valid, and responsive instrument.
- The NDI-U is suitable for assessing disability in Urdu-speaking patients with chronic mechanical neck pain.
