Table 6.

Principal Component Analysis of Qualitative CT Predictors, Age, and GCS

	Components
Predictors	1	2	3	4	5	6	7
Age	0.05	−0.05	0.11	0.16	−0.16	0.96	0.08
GCS	−0.12	0.96	−0.10	−0.06	0.11	−0.05	−0.20
SAH/IPH (present/absent)	0.09	−0.06	0.11	0.97	−0.06	0.16	0.11
SDH (present/absent)	0.15	−0.10	0.95	0.11	−0.04	0.12	0.17
EDH(present/absent)	−0.04	0.10	−0.04	−0.05	0.98	−0.15	−0.04
Shift >5 mm (present/absent)	0.95	−0.12	0.15	0.10	−0.04	0.05	0.23
Cistern effacement	0.35	−0.30	0.25	0.16	−0.06	0.11	0.83

Principal component analysis of qualitative CT predictors, age, and GCS. Thick-lined boxes highlight high loading coefficients ≥0.9. Thin-lined boxes demonstrate intermediate loading coefficients from ∼0.3 up to 0.9. Components 4, 5, and 6 were each driven predominantly by a single feature (subarachnoid/intraparenchymal hemorrhage presence/absence, epidural hematoma presence/absence, and age). Again, there is re-demonstration of covariance among features related to intracranial mass effect (presence/absence of midline shift, presence/absence of cistern effacement, and presence/absence of subdural hematoma) in Components 1 and 3, as well as some collinearity between admission GCS and severity of cistern effacement (Component 2).

GCS, Glasgow Coma Scale; SAH, subarachnoid hemorrhage; IPH, intraparenchymal hemorrhage; SDH, subdural hematoma; EDH, epidural hematoma.