Table 6.
Multivariate analysis of treatment costs
| Coefficient | t statistic | P value | |
| Injury Severity Scalea | |||
| 10 to 16 | 1,062.3 | 5.8 | <0.001 |
| 17 to 25 | 4,328.1 | 13.5 | <0.001 |
| 26 to 75 | 8,921.9 | 18.4 | <0.001 |
| Age groupb | |||
| 25 to 44 years | 1,188.3 | 5.8 | <0.001 |
| 45 to 64 years | 2,777.8 | 11.9 | <0.001 |
| 65 to 74 years | 4,080.4 | 12.4 | <0.001 |
| 75+ years | 5,109.6 | 17.6 | <0.001 |
| Cause of injuryc | |||
| Fall more than 2 metres | -795.4 | -3.3 | 0.001 |
| Fall less than 2 metres | -1,751.8 | -9.9 | <0.001 |
| Blow(s) | -1,700.0 | -6.0 | <0.001 |
| Glasgow Coma Scored | |||
| 9 to 12 | -4,863.9 | -6.90 | <0.001 |
| 13 to 15 | -8,819.9 | -16.5 | <0.001 |
| Serious injuries by body regione | |||
| Abdomen | 3,656.3 | 4.5 | <0.001 |
| Thorax | 1,706.0 | 5.0 | <0.001 |
| Spine | 4,512.9 | 7.9 | <0.001 |
| Upper limb | 1,406.4 | 7.0 | <0.001 |
| Lower limb | 3,220.3 | 20.5 | <0.001 |
| Discharge status: dead | -8,678.1 | -12.8 | <0.001 |
| Grade of most senior doctor seen in the A&E departmentf | |||
| Consultant | 1,841.5 | 7.3 | <0.001 |
| Middle grade | 518.7 | 3.8 | <0.001 |
| Specialty of doctors seen in the A&E department | |||
| Anaesthesia | 2,476.1 | 6.3 | <0.001 |
| General surgery | 1,409.6 | 3.8 | <0.001 |
| Year of admissiong | |||
| 2004 | -633.4 | -3.3 | 0.001 |
| 2005 | -1,152.7 | -5.1 | <0.001 |
| Observations | 19,441 | ||
| Adjusted R2 | 0.283 | ||
Model also includes 43 hospital indicators. A&E, accident and emergency. aOmitted category is 0 to 9. bOmitted category is 18 to 24 years. cOmitted category is road traffic collision. dOmitted category is 3 to 8. eInjuries with an Abbreviated Injury Scale score ≥ 3. fOmitted category is senior house officer. gOmitted category is 2000 to 2003.