Table 1 Baseline characteristics of the study populations with knee pain at baseline
Gazel | Cosali | |||
|---|---|---|---|---|
Men (N = 3190) | Women (N = 950) | Men (N = 356) | Women (N = 261) | |
Duration of follow-up, in years* | 5.99 (5.98-6.00) | 5.99 (5.98-6.00) | 3.85 (3.11-4.86) | 3.66 (2.87-4.83) |
Age, in years | ||||
20-39 | - | - | 159 (42.3%) | 98 (37.5%) |
40-49 | - | - | 132 (35.1%) | 91 (34.9%) |
50-59 | 709 (22.2%) | 324 (34.1%) | 85 (22.6%) | 72 (27.6%) |
60-64 | 1657 (51.9%) | 420 (44.2%) | - | - |
65-69 | 824 (25.8% ) | 206 (21.7% ) | - | - |
BMI | ||||
Normal weight, missing | 1074 (33.7%) | 485 (51.0% ) | 191 (50.8% ) | 159 (60.9% ) |
Overweight | 1597 (50.1% ) | 317 (33.4%) | 146 (38.8%) | 74 (28.3%) |
Obesity | 519 (16.3% ) | 148 (15.6% ) | 39 (10.4%) | 28 (10.7%) |
Socio-professional category | ||||
Executives, others, missing | 541 (17.0% ) | 111 (11.7%) | 33 (8.8%) | 12 (4.6%) |
Associate professionals or technicians | 1834 (57.5% ) | 504 (53.0% ) | 99 (26.3%) | 44 (16.9%) |
Employees | 160 (5.0%) | 330 (34.7%) | 26 (6.9%) | 128 (49.0% ) |
Manual workers | 655 (20.5%) | 5 (0.5%) | 218 (58.0% ) | 77 (29.5%) |
Carrying/Handling heavy loads** | ||||
None | 918 (28.8%) | 667 (70.2% ) | 162 (43.1% ) | 149 (57.1%) |
Short or moderate exposure | 938 (29.4% ) | 99 (10.4%) | 86 (22.9%) | 47 (18.0%) |
Long or severe exposure | 1016 (31.8% ) | 29 (3.0%) | 89 (23.7%) | 27 (10.3%) |
Missing | 318 (10.0%) | 155 (16.3%) | 39 (10.4%) | 38 (14.6%) |
Kneeling | ||||
None | 1082 (33.9%) | 737 (77.6% ) | 126 (33.5%) | 105 (40.2%) |
Short or moderate exposure | 970 (30.4%) | 40 (4.2%) | 132 (35.1% ) | 96 (36.8% ) |
Long or severe exposure | 779 (24.4%) | 9 (0.9%) | 115 (30.6% ) | 59 (22.6% ) |
Missing | 359 (11.2%) | 164 (17.3%) | 3 (0.8%) | 1 (0.4%) |
Occupational change between 2002 and follow-up | ||||
No change | 206 (54.79%) | 141 (54.02%) | ||
Change of job in the same company | 70 (18.62%) | 47 (18.01%) | ||
Change of company | 45 (11.97%) | 32 (12.26%) | ||
Inactive/ missing | 52 (14.63%) | 41 (15.71%) | ||
Walking up more than 10 flights of stairs | ||||
None | 1883 (59.0%) | 750 (78.9%) | ||
Short exposure | 551 (17.3%) | 20 (2.1%) | ||
Long exposure | 276 (8.6%) | 8 (0.8%) | ||
Missing | 480 (15.0%) | 172 (18.1%) | ||
Intensity of pain | ||||
Low, Missing | 1741 (54.6%) | 515 (54.2%) | 106 (28.2%) | 61 (23.4%) |
High | 1449 (45.4%) | 435 (45.8%) | 95 (25.3%) | 64 (24.5%) |
No actual pain | - | - | 175 (46.5%) | 136 (52.1%) |
Past history of knee injury | ||||
No, missing | 1922 (60.3%) | 652 (68.6%) | ||
Yes | 1268 (39.7%) | 298 (31.4%) | ||
Self-assessed origin of knee pain | ||||
Degenerative osteoarthritis | 1349 (42.3%) | 543 (57.2%) | ||
Other | 1559 (48.9%) | 305 (32.1%) | ||
Not completed | 282 (8.8%) | 102 (10.7%) | ||
Knee pain at baseline | ||||
Long-lasting pain | 1310 (41.1% ) | 490 (51.6% ) | 124 (32.98%) | 94 (36.02%) |
Other pain | 1880 (58.9%) | 460 (48.4%) | 252 (67.02% ) | 167 (63.98% ) |
Pain in other areas at baseline | ||||
No pain | 380 (11.9% ) | 69 (7.3% ) | 33 (8.8%) | 8 (3.1%) |
Hip pain | 740 (23.2%) | 345 (36.3%) | 110 (29.3% ) | 107 (41.0% ) |
Pain in other areas | 2070 (64.9%) | 536 (56.4%) | 233 (62.0%) | 146 (55.9%) |