Calculates the Neck Disability Index (NDI) from 10 sections (pain intensity, personal care, lifting, reading, headaches, concentration, work, driving, sleeping, recreation), each scored 0–5. Total 0–50. Mild disability 0–8 (0–16%), moderate 10–28 (20–56%), severe 30–38 (60–76%), complete 40–50 (80–100%).
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