Table 1.

Clinical characteristics.

Variables	N
Number of patients	504
Gender
Male	219 (43.5%)
Female	285 (56.5%)
Age (y)	52.5 ± 10.7
mRS (pre-operation)
0–1	396 (78.6%)
2–4	103 (20.4%)
5	5 (1.0%)
mRS (last follow-up)
0–1	443 (87.9%)
2–4	53 (10.5%)
5–6	8 (1.6%)
Last follow-up period (m)	13.6 ± 4.5