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Table 2 Cox proportional hazards regression model for the time-to-discharge in specialised adult burn services in England and Wales

From: Patient outcomes vs. service workload: an analysis of outcomes in the burn service of England and Wales

Variable Hazard ratio Standard error P > z 95% Confidence Interval
Available   0.982 0.003 0.001 0.976 0.988
Age   0.986 0.000 0.001 0.986 0.987
TBSA (%)   0.954 0.001 0.001 0.952 0.957
Existing disorders 0 Ref
1 0.852 0.018 0.001 0.817 0.888
2 0.721 0.021 0.001 0.681 0.763
3 0.684 0.028 0.001 0.632 0.741
4 0.609 0.029 0.001 0.555 0.669
Injury type Flame Ref
Flash 1.211 0.034 0.001 1.146 1.279
Contact 1.084 0.028 0.002 1.030 1.142
Scald 1.039 0.025 0.116 0.991 1.089
Chemical 1.245 0.040 0.000 1.168 1.327
Other 1.108 0.039 0.003 1.034 1.186
Unknown 1.098 0.094 0.277 0.928 1.299
Inhalation injury Absent Ref
Present 0.778 0.050 0.001 0.686 0.882
Activity Employment Ref
Transport 0.776 0.058 0.001 0.671 0.897
Housework 1.155 0.055 0.002 1.053 1.267
Washing/Bathing 0.623 0.030 0.001 0.566 0.685
Food preparation 0.968 0.028 0.259 0.915 1.024
Sleep/Rest 0.847 0.034 0.001 0.784 0.916
Child play/exploration 1.236 0.141 0.063 0.989 1.546
Household DIY 1.152 0.043 0.001 1.071 1.240
Vehicle DIY 1.106 0.080 0.165 0.959 1.275
Hobby 0.905 0.078 0.249 0.764 1.072
Sport 1.118 0.226 0.581 0.752 1.661
Amusement 0.975 0.053 0.646 0.876 1.085
Socialising 0.925 0.041 0.078 0.849 1.009
Argument/Fight 0.883 0.058 0.056 0.777 1.003
No specific activity 0.848 0.031 0.001 0.790 0.911
Other 0.882 0.026 0.001 0.834 0.934
Unknown 0.932 0.034 0.050 0.868 1.000
Total graft number 0 Ref
1 0.593 0.012 0.001 0.570 0.618
2 0.330 0.015 0.001 0.301 0.362
3 0.303 0.016 0.001 0.273 0.335
Bed severity allocation 1 Ref
2 0.757 0.019 0.001 0.721 0.795
>3 0.625 0.021 0.001 0.584 0.668