Characteristics of study participants. Values are reported as mean ± SD, or number (%).
| Characteristic | Primary Knee Replacement, n = 541 | Primary Hip Replacement, n = 468 | No Primary Joint Replacement, n = 38,014 |
|---|---|---|---|
| Age when entering MCCS, yrs | 60.3 ± 6.8 | 59.7 ± 7.1 | 54.8 ± 8.6 |
| Age when entering JR cohort, yrs | 68.1 ± 6.9 | 67.3 ± 7.2 | 62.6 ± 8.8 |
| Age at JR, yrs | 70.7 ± 6.9 | 70.1 ± 7.2 | |
| Women, n (%) | 344 (63.6) | 283 (60.5) | 22699 (59.7) |
| Body mass index, kg/m2 | 29.8 ± 5.1 | 27.5 ± 4.3 | 26.8 ± 4.4 |
| Country of birth, n (%) | |||
| Australia/United Kingdom | 470 (86.9) | 415 (88.7) | 28751 (75.6) |
| Italy/Greece | 71 (13.1) | 53 (11.3) | 9263 (24.4) |
| Education, n (%) | |||
| Primary and some secondary | 340 (63.1) | 242 (51.9) | 21529 (57.0) |
| Completed secondary and degree/diploma | 199 (36.9) | 224 (48.1) | 16240 (43.0) |
| Participation in moderate to heavy physical exertion at work, n (%) | 44 (8.1) | 37 (7.9) | 3763 (9.9) |
| Self-description of health status, n (%) | |||
| Poor/Fair | 99 (21.7) | 66 (16.0) | 5176 (16.1) |
| Good/Very good/Excellent | 357 (78.3) | 347 (84.0) | 27034 (83.9) |
| Physical function limitation, n (%) | 360 (80.0) | 294 (71.4) | 21626 (68.6) |
| Total physical activity level, n (%) | |||
| None (0) | 106 (19.6) | 96 (20.6) | 8435 (22.2) |
| Low (> 0–3) | 107 (19.8) | 75 (16.0) | 7668 (20.2) |
| Moderate (> 3–4) | 141 (26.0) | 120 (25.7) | 9793 (25.7) |
| High (> 4) | 187 (34.6) | 176 (37.7) | 12115 (31.9) |
| Vigorous activity, n (%) | |||
| None at all | 434 (80.2) | 363 (77.7) | 29857 (78.6) |
| 1–2 times/week | 64 (11.8) | 54 (11.6) | 4308 (11.3) |
| ≥ 3 times/week | 43 (8.0) | 50 (10.7) | 3840 (10.1) |
| Less vigorous activity, n (%)* | |||
| None at all | 258 (59.4) | 213 (58.7) | 19430 (65.1) |
| 1–2 times/week | 84 (19.4) | 73 (20.1) | 5263 (17.6) |
| ≥ 3 times/week | 92 (21.2) | 77 (21.2) | 5162 (17.3) |
| Walking, n (%) | |||
| None at all | 183 (42.2) | 157 (43.2) | 12828 (43.0) |
| 1–2 times/week | 75 (17.3) | 53 (14.6) | 5704 (19.1) |
| ≥ 3 times/week | 176 (40.5) | 153 (42.2) | 11325 (37.9) |
↵* For those who did not report any vigorous activity. MCCS: The Melbourne Collaborative Cohort Study; JR: joint replacement.