Variable

Non reoperated patients

Reoparated patients

Univariate analysis, p-value

Past medical history

24

4

0.276

Diabetes

9

1

0.981

Hypertension

16

1

0.466

Heart disease

4

1

0.445

Sex

Male

32

5

0.179

Female

12

0

Head trauma

14

0

1.136

Use of anticoagulation

7

2

0.187

Radiologic findings

Unilateral

36

4

0.921

Midline shift

34

4

0.890

Presence of false membrane

14

3

0.210

Density of blood

Chronic

16

4

Mixed

17

0

0.131

Subacute

11

1

GOS

1

1

4

3

2

0

<0.001

5

41

1