Table 1.
Patient demographics by registry. Values are count (%) unless otherwise specified
| Factor | Australia | Finland | Permanente | Kaiser Netherlands | New Zealand | Norway | Sweden |
|---|---|---|---|---|---|---|---|
| Age category | |||||||
| 15,306 (13) | 2,726 (12) | 13,176 (30) | 10,866 (9.2) | 6,304 (16) | 3,750 (13) | 7,025 (11) | |
| 55–64 | 27,580 (24) | 5,356 (24) | 15,485 (35) | 24,960 (21) | 10,510 (27) | 6,930 (23) | 14,273 (22) |
| 65–74 | 39,978 (35) | 8,214 (37) | 7,704 (18) | 44,703 (38) | 13,054 (34) | 11,008 (37) | 25,228 (38) |
| 75–84 | 25,907 (23) | 5,318 (24) | 6,018 (14) | 32,657 (28) | 7,429 (19) | 6,877 (23) | 16,447 (25) |
| ≥ 85 | 5,610 (4.9) | 801 (3.6) | 1,355 (3.1) | 5,150 (4.4) | 1,165 (3.0) | 1,274 (4.3) | 2,742 (4.2) |
| Missing | 0 | 0 | 33 | 155 | 0 | 0 | 0 |
| Age, mean (SD) | 67 (12) | 67 (11) | 66 (11) | 69 (12) | 67 (11) | 68 (11) | 68 (11) |
| BMI category | |||||||
| 475 (0.9) | 118 (0.6) | 351 (0.8) | 603 (0.8) | 222 (0.8) | ND | 491 (0.8) | |
| 18.5–24.9 | 11,384 (22) | 5,093 (27) | 9,370 (22.3) | 24,730 (31) | 5,974 (21) | ND | 19,931 (31) |
| 25–29.9 | 19,296 (37) | 7,983 (42) | 15,318 (36.5) | 34,449 (43) | 10,748 (38) | ND | 27,664 (43) |
| 30–34.9 | 12,812 (25) | 4,353 (23) | 10,762 (25.6) | 14,920 (19) | 6,981 (25) | ND | 12,275 (19) |
| 35–39.9 | 5,350 (10) | 1,379 (7.2) | 4,893 (11.6) | 3,906 (4.9) | 3,181 (11) | ND | 3,173 (4.9) |
| ≥ 40 | 2,636 (5.1) | 328 (1.7) | 1,327 (3.2) | 1,000 (1.3) | 1,054 (3.7) | ND | 570 (0.9) |
| Missing | 62,428 | 3,161 | 1,750 | 38,883 | 10,302 | ND | 1,611 |
| BMI, mean (SD) | 29.4 (6.2) | 28.2 (4.8) | 29.1 (5.6) | 27.4 (4.5) | 29.0 (5.6) | ND | 27.3 (4.4) |
| Sex | |||||||
| Women | 60,923 (53) | 12,724 (57) | 25,148 (57) | 77,566 (66) | 20,345 (53) | 18,961 (64) | 37,148 (57) |
| Missing | 0 | 10 | 30 | 248 | 0 | 0 | 0 |
| Diagnosis (primary/secondary OA) | |||||||
| Primary OA | 107,480 (94) | 19,336 (90) | 41,599 (95) | 107,230 (91) | 36,080 (94) | 24,075 (81) | 60,466 (92) |
| Missing | 0 | 1,020 | 0 | 0 | 0 | 87 | 0 |
ND, no data