Table 1

Reliability for status scores for the Kellgren–Lawrence grading scale (KL), OARSI atlas (OARSI) and Verbruggen–Veys anatomical phase score (VV) expressed by intraclass correlation coefficient (ICC)

KLOARSIVV
ReaderICC (95% CI)ICC (95% CI)ICC (95% CI)
Intrareader
 Baseline*10.96 (0.92 to 0.98)0.97 (0.95 to 0.99)0.97 (0.95 to 0.99)
20.93 (0.87 to 0.96)0.96 (0.92 to 0.97)0.97 (0.94 to 0.98)
30.90 (0.81 to 0.95)0.77 (0.61 to 0.87)0.88 (0.78 to 0.93)
Inter-reader
 Baseline*1–20.91 (0.87 to 0.94)0.95 (0.93 to 0.97)0.95 (0.88 to 0.97)
1–30.85 (0.76 to 0.90)0.81 (0.56 to 0.90)0.84 (0.56 to 0.93)
2–30.84 (0.77 to 0.89)0.80 (0.46 to 0.91)0.81 (0.21 to 0.93)
All0.87 (0.82 to 0.91)0.85 (0.71 to 0.91)0.86 (0.66 to 0.93)
  • * ICCs for status scores at years 2 and 6 are very similar to those at baseline.