Table 2 Prevalence of knee OA according to different definitions
Variable | Baseline N (%) | All observations N (%) |
|---|---|---|
N | 4278 | 14,161 |
Symptomatic OA statusa (2-scale) | ||
No | 3134 (73.8) | 9538 (67.8) |
Yes, uni- or bilateral | 1114 (26.2) | 4536 (32.2) |
Symptomatic OA statusa (3-scale) | ||
No | 3134 (73.8) | 9538 (67.8) |
Yes, unilateral | 762 (17.9) | 2999 (21.3) |
Yes, bilateral | 352 (8.3) | 1537 (10.9) |
K-L grade ≥ 2 (2-scale) | ||
No | 1860 (43.5) | 3395 (24.0) |
Yes, uni- or bilateral | 2418 (56.5) | 10,766 (76.0) |
K-L grade ≥ 2 (3-scale) | ||
No | 1860 (43.5) | 3395 (24.0) |
Yes, unilateral | 1112 (26.0) | 4785 (33.8) |
Yes, bilateral | 1306 (30.5) | 5981 (42.2) |
The highest K-L grade | ||
0 | 1199 (28.0) | 2051 (14.5) |
1 | 661 (15.5) | 1344 (9.5) |
2 | 1288 (30.1) | 5544 (39.1) |
3 | 841 (19.7) | 3693 (26.1) |
4 | 289 (6.8) | 1529 (10.8) |
Mean of K-L grades | ||
0.0 | 1199 (28.0) | 2051 (14.5) |
0.5 | 383 (9.0) | 774 (5.5) |
1.0 | 612 (14.3) | 2032 (14.3) |
1.5 | 550 (12.9) | 2346 (16.6) |
2.0 | 728 (17.0) | 3151 (22.3) |
2.5 | 391 (9.1) | 1660 (11.7) |
3.0 | 313 (7.3) | 1470 (10.4) |
3.5 | 100 (2.3) | 566 (4.0) |
4.0 | 2 (0.0) | 111 (0.8) |
Combination of K-L grades | ||
(0;0) | 1199 (28.0) | 2051 (14.5) |
(1;0) | 383 (9.0) | 774 (5.5) |
(1;1) | 278 (6.5) | 570 (4.0) |
(2;0) | 334 (7.8) | 1462 (10.3) |
(2;1) | 403 (9.4) | 1714 (12.1) |
(2;2) | 551 (12.9) | 2368 (16.7) |
(3;0) | 147 (3.4) | 632 (4.5) |
(3;1) | 123 (2.9) | 525 (3.7) |
(3;2) | 340 (7.9) | 1466 (10.4) |
(3;3) | 231 (5.4) | 1070 (7.6) |
(4;0) | 54 (1.3) | 258 (1.8) |
(4;1) | 51 (1.2) | 194 (1.4) |
(4;2) | 82 (1.9) | 400 (2.8) |
(4;3) | 100 (2.3) | 566 (4.0) |
(4;4) | 2 (0.0) | 111 (0.8) |