Cross-cultural adaptation and reliability, agreement, and construct validity of the Turkish neck disability 10 in patients with neck pain

PURPOSE: To cross-culturally adapt the Neck Disability 10 (ND10) into Turkish and evaluate its measurement properties in adults with neck pain and related disorders. MATERIALS AND METHODS: Following forward-backward translation, expert committee review, and cognitive debriefing, 200 Turkish-speaking adults with clinician-confirmed neck pain or neck-related disorders completed the ND10-TR, Neck Disability Index (NDI), Disabilities of the Arm, Shoulder and Hand Questionnaire (DASH), and American Shoulder and Elbow Surgeons Shoulder Assessment Form (ASES). Eighty stable participants completed a 7-day retest. Structural validity, internal consistency, test-retest reliability, agreement, floor/ceiling effects, construct validity, and known-groups validity were examined. RESULTS: = 0.992). No floor/ceiling effects were observed. Test-retest reliability was excellent (ICC(2,1) = 0.952), with SEM = 5.61 and MDC95 = 15.54 points. Construct validity was supported by correlations with NDI (rₛ = 0.826), DASH (rₛ = 0.814), and ASES (rₛ = -0.768), and by known-groups validity across NDI categories. CONCLUSIONS: The ND10-TR is a comprehensible, reliable, and valid measure of neck-related functional disability for Turkish-speaking adults with neck pain, supporting rehabilitation assessment and outcome monitoring.