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Table 3 Ahlbäck grade and HSS score

From: Relationship between radiological grading and clinical status in knee osteoarthritis. a multicentric study

Ahlbäck grade N Mean HSS SD Standard Error Mean 95% confidence interval for mean Min Max
Lower limit Upper limit
I 243 56.91 10.750 0.690 55.55 58.27 32 82
II 358 55.64 12.019 0.635 54.39 56.89 22 95
III 416 51.86 12.966 0.636 50.61 53.11 3 95
IV 241 49.44 12.699 0.818 47.83 51.05 18 94
V 71 47.35 12.322 1.462 44.44 50.27 12 73
Total 1329 53.12 12.596 0.346 52.44 53.80 3 95