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Inter-observer reliability. (A) Horse Chronic Pain Composite Pain Scale (HCP CPS), intraclass correlation coefficient (ICC) = 0.84 (confidence interval CI: 0.74–0.91, p < 0.001). (B) Equine Utrecht University Scale for Facial Assessment of Pain (EQUUS-FAP), ICC = 0.45 (CI: 0.058–0.67, p < 0.05). (C) Horse Chronic Pain Scale (HCPS; combination of HCP CPS and EQUUS-FAP), ICC = 0.78, (CI: 0.62–0.87, p < 0.001). Solid red lines show y = x, (n = 53).
