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Validation and comparison of models predicting survival following intracerebral hemorrhage
S Tuhrim1, D R Horowitz, M Sacher
1Department of Neurology, Mount Sinai School of Medicine, New York, NY 10029-6574, USA.
Objective:
To compare the performance of two previously reported logistic regression models using data independent from those data used to derive the models.
Design:
Prospective.
Setting:
Acute stroke unit of a tertiary care hospital.
Patients:
One hundred twenty-nine patients with supratentorial intracerebral hemorrhage.
Measurements And Main Results:
Model 1 contains the initial Glasgow Coma Scale score, hemorrhage size, and pulse pressure. The more complex model 2 includes, in addition to those three variables, the presence or absence of intraventricular hemorrhage and a term representing the interaction of intraventricular hemorrhage and Glasgow Coma Scale score. The areas under the receiver operating characteristic curves generated for each model were statistically indistinguishable.
Conclusions:
Model 1 predicts 30-day patient status as well as the more complex model 2. Model 1 provides a valid, easy-to-use means of categorizing supratentorial intracerebral hemorrhage patients in terms of their probability of survival.