Table 5.

Etiology of postoperative complication until discharge, according to the classification by Ferroli et al. [7]

Etiological category	Primary surgery	Repeated surgery	p-value
None	1251 (64.5%)	297 (64.2%)	0.892
Traumatic	304 (15.7%)	65 (14.0%)	0.005
CSF-related	55 (2.8%)	20 (4.3%)
Septic	41 (2.1%)	2 (0.4%)
Ischemic	55 (2.8%)	18 (3.9%)
Hemorrhagic	53 (2.7%)	15 (3.2%)
General medicine	120 (6.2%)	21 (4.5%)
Epileptic	37 (1.9%)	19 (4.1%)
Other	24 (1.2%)	6 (1.3%)
	n = 1940 (100%)	n = 463 (100%)