The contribution of separate physical work load factors on the occupational differences in disability retirement due to knee OA among men and women (reference group—professionals)
| Occupational group | Proportion (%) of risk of disability retirement due to knee OA explained* | |||||||||
| Men | Women | |||||||||
| HPW | K | HL | Sit | Stand | HPW | K | HL | Sit | Stand | |
| Managers | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA |
| Professionals | ||||||||||
| Teaching professionals | NA | NA | NA | NA | NA | −6.93† | 11.1 | 0.0 | 66.7 | 18.1 |
| Physical and engineering science technicians | 9.5 | 16.9 | 10.8 | 20.3 | 4.1 | NA | NA | NA | NA | NA |
| Environmental officers and nurses | NA | NA | NA | NA | NA | 39.7 | 10.1 | 4.5 | 34.1 | 10.6 |
| Finance and sales associate professionals and administrative secretaries | 10.4 | 13.2 | 6.6 | 12.3 | 3.8 | 14.6 | 6.3 | 2.1 | 4.2 | −6.3 |
| Office clerks | 20.8 | 10.7 | 8.1 | 13.7 | 2.5 | NA | NA | NA | NA | NA |
| Customer services clerks | 0.0 | −2.1 | 2.1 | −11.6 | 0.0 | NA | NA | NA | NA | NA |
| Service workers | 23.6 | 27.5 | 10.4 | 24.5 | 5.6 | 44.6 | 21.1 | 2.8 | 35.2 | 15.3 |
| Shop workers | 34.6 | 44.4 | 37.0 | 53.1 | 13.6 | 35.8 | 11.6 | 3.3 | 30.7 | 22.8 |
| Agricultural and fishery workers | 53.5 | 75.4 | 44.5 | 34.8 | 10.5 | 66.5 | 24.8 | 8.8 | 37.9 | −3.9 |
| Construction workers, electricians and plumbers | 47.4 | 84.3 | 32.6 | 31.0 | 8.8 | 96.2 | 21.2 | −53.8 | 10.6 | −72.1 |
| Metal and machinery workers | 30.7 | 75.5 | 18.1 | 30.7 | 8.1 | 80.5 | 54.0 | 9.2 | 49.4 | 28.7 |
| Craft workers | 27.2 | 46.9 | 18.0 | 24.6 | 4.4 | 35.4 | 8.9 | 2.5 | 22.2 | 0.0 |
| Chemical, wood and metal processing workers | 24.7 | 28.4 | 21.9 | 22.7 | 6.0 | 50.2 | 4.4 | 3.5 | 19.9 | 11.0 |
| Machine operators and assemblers | 27.3 | 35.9 | 24.2 | 26.0 | 6.5 | 54.3 | 2.2 | 2.7 | 12.6 | 11.7 |
| Professional drivers | 32.8 | 18.9 | 28.4 | 17.4 | 0.5 | 47.9 | 6.1 | 6.9 | −2.5 | −0.6 |
| Building caretakers, cleaners, assistant nurses and kitchen workers | 29.8 | 46.6 | 13.0 | 29.3 | 6.2 | 48.0 | 19.0 | 2.7 | 37.2 | 14.1 |
| Unskilled transport, construction and manufacturing workers | 38.2 | 46.5 | 29.9 | 27.9 | 7.3 | 70.2 | 13.9 | 6.5 | 29.4 | 19.4 |
*The percentage of attenuation of HR (with professionals as reference) after adjustment: (HRModel 3−HRModel 2)/(HRModel 2−1)×100%, model 2 adjusted for age and education, model 3 adjusted for age, education and physical work load factor.
†Negative value indicates an increase in HR after adjustment for the physical work load factor in question.
HL, heavy lifting; HPW, heavy physical work; K, kneeling or squatting; NA, not applicable; Sit, sitting; Stand, standing or moving.