Table 2 Comparison of patients with and without CSF leakage.

Factor	Total, n (%) (N = 319)	CSF leakage (+), n (%) (N = 11)	CSF leakage (−), n (%) (N = 308)	P value
Age (years)	60.0 (49.0–71.0)	54.0 (35.0–63.0)	60.0 (49.0–72.0)	0.06
Female	166 (52)	7 (63.6)	159 (51.6)	0.55
Cervical	72 (22.6)	5 (45.5)	67 (21.8)	0.13
Thoracic	131 (41.2)	2 (18.2)	129 (42)	0.13
Tumor	274 (85.9)	9 (81.8)	265 (86)	0.66
Dumbbell tumor	35 (11)	3 (27.3)	32 (10.4)	0.11
Cervicothoracic intramedullary tumor	17 (5.3)	1 (9.1)	16 (5.2)	0.46
Schwannoma	170 (53.3)	8 (72.7)	162 (52.6)	0.23
Meningioma	61 (19.1)	0 (0)	61 (19.8)	0.13
Operation time (min)	222 (171–290)	258 (140–457)	216 (170–280)	0.33
Blood loss (g)	120 (50–258)	125 (60–325)	120 (50–257)	0.80
Bed rest (days)	3 (3–4)	5 (4–13)	3 (3–3.8)	< 0.001
JOAs improvement rate (%)	70.0 (43.7–85.7)	64.7 (47.1–85.7)	72.2 (45.5–85.7)	0.89

Median (25% quartile–75% quartile). JOA improvement rate (%) = ([post JOA] − [pre JOA]/[total JOA] − [pre JOA]) × 100. JOAs Japanese Orthopedic Association score.

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