| Included | Excluded | ||
---|---|---|---|---|
Knee (n = 8,801) | Hip (n = 5,875) | Total (n = 14,676) | n = 1,979 | |
Female, n (%) | 6,530 (74.2) | 4,549 (77.4) | 11,079 (75.5) | 1493 (75.4) |
Age, mean (± SD) | 64.0 (± 9.0) | 64.1 (± 9.2) | 64.0 (± 9.1) | 65.7 (± 10.3) |
 21–50 years, n (%) | 648 (7.4) | 443 (7.5) | 1,091 (7.4) | 158 (8.0) |
 51–65 years, n (%) | 4,184 (47.5) | 2,691 (45.8) | 6,875 (46.9) | 755 (38.2) |
 66–74 years, n (%) | 2,931 (33.3) | 2,002 (34.1) | 4,933 (33.6) | 678 (34.3) |
 75 + years, n (%) | 1,038 (11.8) | 739 (12.6) | 1,777 (12.1) | 388 (19.6) |
Education, n (%) | ||||
 Less than high school | 701 (8.0) | 483 (8.2) | 1,184 (8.1) | 180 (9.1) |
 High school | 3,149 (35.8) | 2,120 (36.1) | 5,269 (33.9) | 703 (35.5) |
 College/university | 4,951 (56.3) | 3,272 (55.7) | 8,223 (56.0) | 1,096 (55.4) |
Body mass index, mean (± SD) | 27.6 (± 4.9) | 26.5 (± 4.4) | 27.2 (± 4.7) | 27.2 (± 4.8) |
Employment, n (%) | ||||
 Working | 3,944 (44.8) | 2,537 (43.2) | 6,481 (44.2) | 707 (35.7) |
 Not working | 445 (5.1) | 272 (4.6) | 717 (4.9) | 139 (7.0) |
 Retired | 4,412 (50.1) | 3,066 (52.2) | 7,478 (51.0) | 1,133 (57.3) |
Diabetes, n (%) | 504 (5.7) | 318 (5.4) | 822 (5.6) | 171 (8.6) |
Lung diseases, n (%) | 917 (10.4) | 642 (10.9) | 1,559 (10.9) | 227 (11.5) |
Balance troubles, n (%) | 284 (3.2) | 205 (3.5) | 489 (3.3) | 112 (5.7) |
Rheumatoid arthritis, n (%) | 396 (4.5) | 273 (4.7) | 669 (4.6) | 130 (6.6) |
Cardiovascular diseases, n (%) | 622 (7.1) | 462 (7.9) | 1,084 (7.4) | 211 (10.7) |
Walking difficulties, n (%) | 1,027 (11.7) | 779 (13.3) | 1,806 (12.3) | 317 (16.0) |
General health, mean (± SD) | 6.6 (± 1.9) | 6.5 (± 1.8) | 6.6 (± 1.8) | 6.4 (± 2.0) |
Pain, mean (± SD) | 5.1 (± 2.0) | 5.1 (± 1.9) | 5.1 (± 1.9) | 5.2 (± 2.1) |
Physical function, mean (± SD) | 12.6 (± 4.3) | 13.0 (± 4.4) | 12.8 (± 4.3) | 12.0 (± 4.4) |
WPAI–OA activity impairment (%), mean (± SD) | 40.3 (± 23.8) | 37.9 (± 23.4) | 39.3 (± 23.7) | 41.8 (± 24.9) |
WPAI–OA absenteeism (%), mean (± SD)a | 2.7 (± 13.4) | 2.1 (± 11.4) | 2.4 (± 12.7) | 2.8 (± 13.0) |
WPAI–OA presenteeism (%),mean (± SD)a | 21.7 (± 22.8) | 22.0 (± 21.2) | 21.8 (± 22.2) | 23.2 (± 22.7) |
WPAI–OA overall work impairment (%), mean (± SD)a | 24.4 (± 25.7) | 24.1 (± 23.7) | 24.3 (± 24.9) | 25.9 (± 25.6) |
Follow up responses, n (%) | ||||
 1 | 3,614 (41.1) | 2,547 (43.4) | 6,161 (42.0) | - |
 2 | 2,087 (23.7) | 1,445 (24.6) | 3,532 (24.1) | - |
 3 | 1,481 (16.8) | 893 (15.2) | 2,374 (16.2) | - |
 4 | 1,619 (18.4) | 990 (16.9) | 2,609 (17.8) | - |