Table 2.

Intermethod agreement, 2-grade- and 4-grade analysis**

Rater	4-grade analysis (Dejour)		2-grade analysis (High/Low)
	t1	t2	t1	t2
Cohen’s Kappa
1	0.41	0.40	0.76	0.51
2	0.33	0.45	0.48	0.66
3	0.34	0.42	0.29	0.35
4	0.19	0.12	0.27	0.30
Proportion of agreement
1	57% (41;73)	57% (41;73)	89% (79;99)	78% (65;91)
2	41% (50;80)	41% (25;57)	65% (50;80)	65% (50;80)
3	51% (65;91)	59% (43;75)	76% (62;90)	84% (72;96)
4	51% (53;83)	57% (41;73)	65% (50;80)	68% (53;83)

^**4-grade analysis, Dejour classification; 2-grade analysis, high/low grade trochlear dysplasia; t1, time point 1; t2, time point 2; values in parenthesis represent 95% confidence interval