The Danish Neck Disability Index: New Insights into Factor Structure, Generalizability, and Responsiveness.
Henrik Hein LauridsenLotte O'NeillAlice KongstedJan HartvigsenPublished in: Pain practice : the official journal of World Institute of Pain (2016)
The modified Danish 8-item NDI was unidimensional, had construct validity, and was reproducible with a large but acceptable measurement error. However, responsiveness was poor and a significant floor effect was found in PSPs. A change score representing the MIC is proposed for PSPs.