The ODI is a specific instrument used to measure disability in patients with LBP.11 It includes 10-item scale (pain intensity, personal care, lifting, walking, sitting, standing, sleeping, work, social life and traveling) with 6 levels from 0 to 5. A total score is calculated by adding the 10 items to obtain a partial score from 0 to 50. The score is transformed to obtain a 0–100 scale. The total score could be categorised in minimal disability (0–20), moderate disability (21–40), severe disability (41–60), crippled (61–80) and bed-bound or exaggerating their symptoms (81–100).
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