Secondary outcomes
There were 10 (2.6%) postoperative cerebrovascular events: 5 (1.3%)
TIAs and 5 (1.3%) strokes (major n = 3, minor n = 2). This rate was not
different among the enrolling centers (1.6% vs . 3.7% vs .
2.9%, p = 0.509); although there was a continuous decrease
through the four quartiles of the study period, the difference was not
statistically significant (5.9% vs . 3.7% vs . 2.5%vs . 1.4%, p = 0.365). Postoperative stroke was not
significantly associated neither with gender (OR: 0.94, P = 1.0)
nor with elderly patients aged >80 years (OR: 0.51,p = 0.998), nor with the use of shunt (OR: 1.65, p =
0.655).