Table 3

Reproducibility of the two readers

				K&L≥1		K&L≥2
Alternatives	No of knees	Weighted κ value	95% CI	% Agreement	κ Value	% Agreement	κ Value
Original description	659	0.41	0.32 to 0.49	76	0.32	95	0.62
Alternative 1	144	0.66	0.53 to 0.79	86	0.63	96	0.73
Alternative 2	114	0.69	0.58 to 0.80	86	0.66	94	0.72
Alternative 3	152	0.63	0.50 to 0.76	83	0.53	97	0.82
Alternative 4	158	0.35	0.24 to 0.46	61	0.31	97	0.70

K&L, Kellgren and Lawrence.