Table 4.
Associations of occupational tasks with radiographic and symptomatic hip OA: results of logistic regression models.
| Radiographic Hip OA | Symptomatic Hip OA | |||||
|---|---|---|---|---|---|---|
| No OA Exposed, N (%) | OA Exposed, N (%) | Adjusted OR* (95% CI) | No OA Exposed, N (%) | OA Exposed, N (%) | Adjusted OR* (95% CI) | |
| 10 tasks performed at longest job and no. of exposures† | ||||||
| Walk | 1174 (72.8) | 568 (72.4) | 1.15 (0.92–1.43) | 1525 (72.4) | 203 (75.2) | 1.38 (1.00–1.91) |
| Lift > 10 lbs | 716 (44.6) | 367 (46.7) | 1.20 (0.98–1.46) | 926 (44.0) | 146 (53.9)** | 1.67 (1.26–2.23) |
| Sit | 669 (41.6) | 314 (40.0) | 0.94 (0.77–1.14) | 875 (41.3) | 103 (38.0) | 0.81 (0.61–1.07) |
| Stand | 1051 (65.2) | 524 (66.8) | 1.15 (0.94–1.42) | 1379 (65.5) | 187 (69.0) | 1.30 (0.97–1.75) |
| Bend, twist, reach | 980 (60.9) | 480 (61.1) | 1.21 (0.98–1.48) | 1264 (60.0) | 271 (67.9)** | 1.60 (1.18–2.17) |
| Squat | 350 (21.8) | 164 (20.9) | 1.03 (0.81–1.30) | 452 (21.5) | 48 (21.4) | 1.11 (0.79–1.57) |
| Climb stairs | 351 (21.8) | 167 (21.3) | 1.01 (0.80–1.28) | 456 (21.7) | 59 (21.8) | 1.17 (0.84–1.62) |
| Crawl | 107 (6.6) | 60 (7.6) | 1.35 (0.93–2.00) | 137 (6.5) | 30 (11.1)** | 2.28 (1.43–3.65) |
| Crouch or kneel | 193 (12.8) | 88 (12.6) | 1.15 (0.84–1.56) | 243 (12.5) | 37 (14.5) | 1.45 (0.95–2.21) |
| Heavy work, standing | 180 (12.0) | 84 (12.1) | 1.20 (0.88–1.63) | 222 (11.4) | 41 (16.1)** | 1.75 (1.17–2.61) |
| No. of exposures†† | mean = 3.2 | mean = 3.3 | 1.04 (0.99–1.09) | mean = 3.2 | mean = 3.2 | 1.13 (1.06–1.22) |
| Lifetime exposure to 8 occupational tasks and no. of exposures | ||||||
| Light work while standing > 50% of job | 422 (25.9) | 202 (25.8) | 1.05 (0.85–1.29) | 560 (26.4) | 63 (21.7) | 0.74 (0.54–1.01) |
| Heavy work while standing > 50% of job | 328 (20.1) | 1.44 (18.3) | 1.04 (0.82–1.32) | 405 (19.1) | 65 (22.3) | 1.39 (1.01–1.91) |
| Sitting > 50% of job | 776 (47.6) | 356 (45.4) | 0.96 (0.79–1.16) | 1007 (47.6) | 125 (43.0) | 0.80 (0.61–1.04) |
| Kneeling > 50% of job | 209 (12.9) | 85 (10.9) | 0.84 (0.62–1.14) | 256 (12.1) | 36 (12.4) | 1.15 (0.76–1.73) |
| Walking > 50% of job | 703 (43.2) | 344 (44.1) | 1.15 (0.95–1.40) | 914 (43.3) | 131 (45.0) | 1.19 (0.90–1.56) |
| Lifting 10 kg ≥ 10×/week | 670 (41.1) | 315 (40.2) | 1.10 (0.90–1.36) | 851 (40.2) | 132 (45.2) | 1.71 (1.28–2.29) |
| Lifting 20 kg ≥ 10×/week | 402 (24.6) | 177 (22.6) | 1.03 (0.80–1.32) | 501 (23.6) | 75 (25.7) | 1.63 (1.15–2.30) |
| Lifting 50 kg ≥ 10×/week | 148 (9.1) | 75 (9.6) | 1.02 (0.73–1.43) | 183 (8.6) | 38 (13.0)* | 1.88 (1.20–2.92) |
| No. of exposures†† | mean = 2.2 | mean = 2.2 | 1.02 (0.96–1.09) | mean = 2.2 | mean = 2.3 | 1.10 (1.01–1.20) |
*
Multivariable logistic regression models adjusted for age, gender, race, body mass index, smoking (ever and current vs never), prior knee injury, and household tasks.
**
Significant chi-square test (p < 0.05).
†
Tasks for longest job are 0 = never, seldom, sometimes; 1 = often or always.
††
Excludes sitting.