Table 4

HRs and 95% CIs of full-time disability retirement due to knee OA in 2005–2013 among men and women by occupational group (reference group—professionals)

Occupational group	Men								Women
	Model 1		Model 2			Model 3			Model 1		Model 2			Model 3
	HR	95% CI	HR	95% CI	PRE*	HR	95% CI	PRE†	HR	95% CI	HR	95% CI	PRE	HR	95% CI	PRE
Managers	1.07	0.71 to 1.74	0.95	0.61 to 1.50	NA	0.90	0.57 to 1.41	NA	1.62	1.01 to 2.58	1.47	0.92 to 2.35	24.2	1.59	0.99 to 2.54	NA
Professionals	1.00		1.00			1.00			1.00		1.00			1.00
Teaching professionals	1.34	0.82 to 2.19	1.36	0.82 to 2.22	NA	1.26	0.76 to 2.01	NA	1.51	1.04 to 2.18	1.72	1.19 to 2.49	−41.2‡	1.25	0.85 to 1.83	65.3
Physical and engineering science technicians	4.13	2.99 to 5.69	2.48	1.78 to 3.45	52.7	2.20	1.55 to 3.11	18.9	2.05	1.20 to 3.51	1.12	0.66 to 1.93	88.6	1.04	0.60 to 1.78	NA
Environmental officers and nurses	2.98	1.51 to 5.88	1.87	0.94 to 3.71	56.1	1.60	0.79 to 3.23	NA	3.33	2.40 to 4.61	2.79	2.00 to 3.90	23.2	1.81	1.27 to 2.56	54.7
Finance and sales associate professionals and administrative secretaries	3.89	2.81 to 5.36	2.06	1.47 to 2.87	63.3	1.91	1.35 to 2.69	14.2	2.59	1.90 to 3.53	1.48	1.07 to 2.03	69.8	1.40	1.02 to 1.93	16.7
Office clerks	6.64	4.68 to 9.40	2.97	2.06 to 4.27	65.1	2.62	1.80 to 3.81	17.8	2.51	1.83 to 3.45	1.32	0.95 to 1.82	78.8	1.42	1.02 to 1.97	NA
Customer services clerks	3.76	1.17 to 12.1	1.95	0.61 to 6.27	65.6	2.01	0.62 to 6.49	NA	1.93	1.27 to 2.94	0.96	0.63 to 1.47	104.3	1.38	0.89 to 2.14	NA
Service workers	12.7	9.19 to 17.4	5.32	3.80 to 7.44	63.1	3.84	2.61 to 5.66	34.3	9.68	7.31 to 12.8	4.27	3.18 to 5.74	62.3	2.00	1.44 to 2.77	69.4
Shop workers	4.26	2.75 to 6.60	1.81	1.15 to 2.84	75.2	1.41	0.84 to 2.37	49.4	7.35	5.39 to 10.0	3.15	2.28 to 4.34	66.1	1.88	1.33 to 2.64	59.1
Agricultural and fishery workers	8.75	6.48 to 11.8	3.56	2.28 to 4.89	67.0	1.57	0.97 to 2.56	77.7	14.4	10.7 to 19.5	6.44	4.72 to 8.80	59.4	2.56	1.77 to 3.71	71.3
Construction workers, electricians and plumbers	16.6	12.5 to 22.2	6.55	4.82 to 8.92	64.4	1.82	1.06 to 3.13	85.2	6.52	3.60 to 11.8	2.04	1.56 to 5.17	81.2	0.80	0.41 to 1.54	119.2
Metal and machinery workers	11.7	8.79 to 15.6	4.71	3.46 to 6.41	65.3	1.88	1.19 to 2.97	76.3	4.35	2.36 to 7.99	1.87	1.01 to 3.45	74.0	0.82	0.43 to 1.57	120.7
Craft workers	7.83	5.41 to 11.4	3.28	2.22 to 4.83	66.6	2.10	1.38 to 3.20	51.8	5.87	3.09 to 8.86	2.58	1.69 to 3.93	67.6	1.87	1.22 to 2.86	44.9
Chemical, wood and metal processing workers	11.7	8.31 to 15.7	4.52	3.22 to 6.33	67.1	3.41	2.30 to 5.06	31.5	10.1	6.73 to 15.2	4.17	2.75 to 6.31	65.2	2.51	1.62 to 3.88	52.4
Machine operators and assemblers	8.36	6.05 to 11.5	3.31	2.36 to 4.66	68.6	2.41	1.62 to 3.59	39.0	7.85	5.70 to 10.8	3.23	2.31 to 4.51	67.4	2.02	1.41 to 2.88	54.3
Professional drivers	7.72	5.72 to 10.4	3.01	2.18 to 4.15	70.1	2.44	1.70 to 3.50	28.4	10.8	6.86 to 16.9	4.61	2.91 to 7.30	63.2	3.68	2.29 to 5.92	25.8
Building caretakers, cleaners, assistant nurses and kitchen workers	12.2	8.85 to 16.7	4.86	3.47 to 6.81	65.5	2.83	1.88 to 4.27	52.6	15.5	11.7 to 20.6	6.46	4.79 to 8.70	62.3	2.61	1.86 to 3.66	70.5
Unskilled transport, construction and manufacturing workers	12.7	9.21 to 17.4	4.98	3.56 to 6.96	66.0	2.96	1.93 to 4.54	50.8	9.99	6.93 to 14.4	4.09	2.80 to 5.95	65.6	1.74	1.15 to 2.63	76.1

Model 1: adjusted for age, model 2: adjusted for age and education, model 3: adjusted for age, education and physical work load factors.
*PRE: proportion explained by education (%)—the percentage of attenuation of HR (with professionals as reference) after adjustment for education: (HR_{Model 2}−HR_{Model 1})/(HR_{Model 1}−1)×100%.
†PRE: proportion explained by physical work load factors (%)—the percentage of attenuation of HR (with professionals as reference) after adjustment for physical work load factors: (HR_{Model 3}−HR_{Model 2})/(HR_{Model 2}−1)×100%.
‡Negative value indicates an increase in HR after adjustment.
NA, not applicable.