Predictors of return to work following motor vehicle related orthopaedic trauma

Table 4 Cox proportional hazards regression model for predictors of time (days) to RTW

Factor	B	SE	P value	HRR	95 % CI
Age	0.009	0.006	0.10	1.010	0.998–1.021
Sex (Male)	−0.038	0.202	0.851	0.963	0.648–1.430
New Injury Severity Score			0.007
Minor - moderate 1-8	-	-	-	-	-
Serious 9-15	−0.170	0.202	0.401	0.844	0.568–1.254
Severe - critical 16-75	−0.619	0.216	0.004	0.539	0.353–0.822
Occupation skill level^a			0.05
Managers/administrators/professionals/associate professionals	-	-	-	-	-
Tradespersons/advanced clerical and service workers	−0.355	0.204	0.081	0.701	0.470–1.045
Intermediate clerical/sale/service production/transport workers	−0.311	0.249	0.211	0.733	0.450–1.193
Elementary clerical/sales/service/labourers/related workers	−0.632	0.227	0.003	0.532	0.341–0.829
Work hours before injury (Full-time)^b	0.688	0.232	0.003	1.989	1.261–3.136
Recovery expectations for usual activities (≤90 days)	0.741	0.174	<0.001	2.099	1.494–2.949
Self-assessed pre-injury health status^c			0.005
Excellent	-	-	-	-	-
Very good	0.343	0.184	0.062	1.409	0.983–2.019
Good	−0.111	0.219	0.612	0.895	0.582–1.376
Fair-Poor	−1.029	0.476	0.031	0.357	0.141–0.908
			0.090
Current smoker	-	-	-	-	-
Ex-smoker	0.368	0.222	0.097	1.445	0.936–2.232
Never smoked	0.434	0.201	0.031	1.543	1.041–2.288

^aMeasures for occupation and education are from the Australian Standard Classification of Occupations (ASCO), Cat. No. 1220.0, Australian Bureau of Statistics 1997
^bMeasures for full-time (usually working at least 35 hours per week) and part-time (usually working 1–35 hours per week) are from the Australian Health Survey: Users' Guide, 2011–13, Cat. No. 4363.0.55.001, Australian Bureau of Statistics
^cSelf-assessed health status is based on Question 1 from the Short Form-36, Version 2.0, (SF36v2)

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