Table 2.

Incidence of surgical complications in elective cranial neurosurgery for malignant brain tumors between 2002 and 2011.

Year	2002	2003	2004	2005	2006	2007	2008	2009	2010	2011	Total	P – value
Cases	728	1,588	1,466	1,461	1,769	1,891	1,874	1,580	2,056	2,117	16,530
Object retention	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	*	0.7 (n < 10)*	0.149
Wrong-side surgery	0.0	*	0.0	0.0	0.0	0.0	*	0.0	0.0	0.0	0.7 (n < 10)*	0.400
Iatrogenic stroke	14.1	15.1	10.2	13.0	17.0	13.7	19.7	15.8	19.5	19.8	16.3 (n = 269)	0.023
Meningitis	0.0	*	*	*	*	*	*	*	*	*	1.1 (n = 19)	0.266
Hemorrhage or hematoma	6.4	10.0	10.2	15.1	13.0	8.5	8.0	11.4	12.6	6.6	10.3 (n = 170)	0.536
Other nervous system complication	*	6.9	10.2	8.9	7.3	7.4	*	10.8	11.2	9.4	8.2 (n = 137)	0.126
Total incidence	23.0 (n = 18)	34.0 (n = 54)	31.4 (n = 46)	37.6 (n = 55)	39.0 (n = 69)	30.0 (n = 57)	36.3 (n = 68)	40.5 (n = 64)	44.3 (n = 91)	37.3 (n = 79)	36.4 (n = 601)	0.061

Incidence is per 1000 cases.

Boldface denotes statistically significant results (linear regression analysis).

^*NIS does not allow the publication of values that are less than or equal to 10 observations.