Calculates the Oswestry Disability Index (ODI) from 10 sections (pain intensity, personal care, lifting, walking, sitting, standing, sleeping, social life, traveling, and changing degree of pain), each scored 0–5. ODI % = (sum / 50) × 100. Minimal disability 0–20%, moderate 21–40%, severe 41–60%, crippled 61–80%, bed-bound 81–100%.
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