Table 2.

Logistic regression: predictors of surgical evacuation.

Predictors of surgery	Odds ratio (95% C.I.)	P-value	Odds ratio (95% C.I.) adjusted for propensity score	P-value
Age	0.97	0.007	0.98	0.208
	(0.95, 0.99)		(0.95, 1.01)
Focal neurologic deficit	4.89	< 0.001	2.98	0.266
	(2.57, 9.30)		(0.44, 20.47)
Diameter > 10 mm	4.18	< 0.001	2.84	0.190
	(2.05, 8.54)		(0.60, 13.58)
Midline shift > 5 mm	10.82	< 0.001	4.81	0.292
	(5.55,21.11)		(0.26, 89.26)
Subdural acuity	3.30	0.001	1.54	0.241
(Reference: acute)	(1.63,6.70)		(0.75, 3.19)

Note: The left column shows odds ratios and 95% confidence intervals (C.I.) for covariables that proved statistically significant and the admission Glasgow coma scale (GCS) score; these variables were used to create the propensity score for surgical evacuation. The right column shows results after adjustment for the propensity score.