Table 6

Multivariate analysis of treatment costs

Coefficient

t statistic

P value

Injury Severity Scale^a

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 group^b

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 injury^c

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 Score^d

9 to 12

-4,863.9

-6.90

<0.001

13 to 15

-8,819.9

-16.5

<0.001

Serious injuries by body region^e

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 department^f

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 admission^g

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.

Christensen et al. Critical Care 2008 12:R23   doi:10.1186/cc6797