Table 4

Comparison between the four alternative descriptions and the original description, at the three cut-off points

			K&L≥1				K&L≥2				K&L≥3
Descriptions	Weighted κ (ref. O)^*	95% CI	% Cases alternative	% Cases original	κ Value (ref. O)	Sens/spec (ref. O) (%)	% Cases alternative	% Cases original	κ Value (ref. O)	Sens/spec (ref. O) (%)	% Cases alternative	% Cases original	κ Value (ref. O)	Sens/spec (ref. O) (%)
Alternative 1 (n=840)^†	0.50	0.43 to 0.57	25.5	17.3	0.40	65/83	10.5	5.5	0.66	100/95	3.1	1.7	0.69	100/99
Alternative 2 (n=1102)	0.50	0.43 to 0.55	23.1	18.8	0.39	58/85	7.2	5.4	0.72	86/97	3.0	1.3	0.59	100/98
Alternative 3 (n=1180)	0.52	0.46 to 0.58	24.3	19.5	0.36	56/83	5.6	5.5	0.99	100/100	2.2	1.3	0.73	100/99
Alternative 4 (n=1189)	0.47	0.42 to 0.53	49.1	17.1	0.35	100/61	4.9	4.9	1	100/100	1.2	0.8	0.83	100/100

↵* Ref. O, reference original description.
Sens/spec, Sensitivity and specificity.
↵† The same number of knees is used for the alternative and the original score per row.
K&L, Kellgren and Lawrence.