Table 1.

Data labeling method for each Kellgren-Lawrence grade in the study

Dataset (total number of images)	KL grade	Number of images (proportion, %)
Training set (37,462)	0	14,906 (39.8)
	1	7022 (18.7)
	2	9149 (24.4)
	3	4920 (13.1)
	4	1465 (3.9)
Validation set (9186)	0	3483 (37.9)
	1	1785 (19.4)
	2	2257 (24.6)
	3	1292 (14.1)
	4	396 (4.3)
Test set (17,040)	0	7148 (41.9)
	1	2689 (15.8)
	2	3024 (17.7)
	3	2922 (17.1)
	4	1257 (7.4)

KL, Kellgren–Lawrence