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Nondistressed adults reported significantly less disability due to neck pain than psychologically distressed subjects. The NDI was found to contain two factors that pertain to three domains of the disability. Five items relating to impairments in bodily function strongly correlated with depression and somatization. Presence of psychological distress has a confounding effect on NDI scores. An outcome measure containing items related only to activity limitations and participation restrictions might give a truer picture of disability associated with neck pain for patients with psychological distress.

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