Table 3.

Independent risk factors associated with postoperative pneumonia (POP) in all patients (N = 843).

Variables	OR (95%CI)	p
Age	1.03 (1.01–1.04)	<0.001
Female	1.53 (1.10–2.14)	0.012
WFNS grade 4–5	4.43 (3.09–6.37)	<0.001
mFS grade 3–4	3.04 (1.82–5.07)	<0.001
Surgical clipping	1.43 (1.03–1.98)	0.031

OR, odds ratio; CI, confidence interval; WFNS, World Federation of Neurological Societies; mFS, modified Fisher Scale.