Patient selection: traumatic brain injury (TBI)
Outcomes at 6 months: Glasgow Outcome Scale 1 to 3 (death, vegetative state, severe disability)
Parameters:
(1) subdural hematoma
(2) intracerebral hematoma
(3) epidural hematoma
(4) mass lesion size
(4) intraventricular hemorrhage
(5) suprasellar cisterns)
|
Parameter
|
Finding
|
Points
|
|
subdural hematoma
|
absent
|
0
|
|
|
present
|
2
|
|
intracerebral hematoma
|
absent
|
0
|
|
|
present
|
2
|
|
epidural hematoma
|
absent
|
0
|
|
|
present
|
-3
|
|
mass lesion size
|
<= 25 cc
|
0
|
|
|
> 25 cc
|
2
|
|
intraventricular hemorrhage
|
absent
|
0
|
|
|
present
|
3
|
|
suprasellar cisterns
|
normal
|
0
|
|
|
compressed
|
1
|
|
|
obliterated
|
5
|
total score =
= SUM(points for all of the parameters)
Interpretation:
• minimum score: -3
• maximum score: 14
value of X =
= (0.287 * (score)) - 2.666
value of Y =
= (0.319 * (score)) - 1.636
probability of death =
= 1 / (1 + EXP((-1) * X))
probability of unfavorable outcome =
= 1 / (1 + EXP((-1) * Y))
Performance:
• The area under the ROC curve for mortality and unfavorable outcome was 0.75.
