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

From: Predictors of return to work following motor vehicle related orthopaedic trauma

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 levela    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 statusc    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
  1. aMeasures for occupation and education are from the Australian Standard Classification of Occupations (ASCO), Cat. No. 1220.0, Australian Bureau of Statistics 1997
  2. 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
  3. cSelf-assessed health status is based on Question 1 from the Short Form-36, Version 2.0, (SF36v2)