Table 5

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 groupProportion (%) of risk of disability retirement due to knee OA explained*
 Teaching professionalsNANANANANA−6.93†
 Physical and engineering science technicians9.516.910.820.34.1NANANANANA
 Environmental officers and nursesNANANANANA39.710.14.534.110.6
 Finance and sales associate professionals and administrative secretaries10.413.26.612.33.814.−6.3
 Office clerks20.810.
 Customer services clerks0.0−2.12.1−11.60.0NANANANANA
 Service workers23.627.510.424.55.644.621.12.835.215.3
 Shop workers34.644.437.053.113.635.811.63.330.722.8
 Agricultural and fishery workers53.575.444.534.810.566.524.88.837.9−3.9
 Construction workers, electricians and plumbers47.484.332.631.08.896.221.2−53.810.6−72.1
 Metal and machinery workers30.775.518.
 Craft workers27.246.918.024.64.435.48.92.522.20.0
 Chemical, wood and metal processing workers24.728.421.922.
 Machine operators and assemblers27.335.924.226.06.554.32.22.712.611.7
 Professional drivers32.818.928.417.40.547.96.16.9−2.5−0.6
 Building caretakers, cleaners, assistant nurses and kitchen workers29.846.613.
 Unskilled transport, construction and manufacturing workers38.246.529.927.97.370.213.96.529.419.4
  • *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.