Table 12. Most predictive variables of intraoperative blood loss on multivariate regression analysis.

Variable	OR	95% CI	p -Value
Abbreviations: CI, confidence interval; HTN, hypertension; OR, odds ratio.
Female gender	2.44	1.37–4.35	0.002
HTN	0.33	0.13–0.82	0.017
Tumor size >5 cm	2.3	1.24–4.28	0.008
Vascular tumor (imaging)	2.31	1.32–4.05	0.003
Extended craniotomy approach	0.63	0.44–0.89	0.009
Colloids >1,000 mL	27.32	6.68–111.68	<0.001
High vascularity (appearance)	2.09	1.29–3.37	0.003
Surgery duration >300 min	1.01	1–1.01	<0.001
Pathology–meningioma	0.51	0.24–1.04	0.065
Location–skull base	0.53	0.26–1.04	0.065