Table 1 The result of single-factor analysis

Gender

Male

37 (48.7 %)

195 (45.7 %)

0.627

Famle

39 (51.3 %)

232 (54.3 %)

Age

<20

8 (10.5 %)

50 (11.7 %)

0.800

20 ~ 40

29 (38.2 %)

180 (42.2 %)

40 ~ 60

34 (44.7 %)

165 (38.6 %)

≥60

5 (6.6 %)

32 (7.5 %)

Location of DVA

supratentorial

35 (46.1 %)

327 (76.6 %)

<0.001

infratentorial

41 (53.9 %)

100 (23.4 %)

Direction of draining vein

Deep

57 (79.2 %)

181 (42.4 %)

<0.001

Superficial

19 (20.8 %)

246 (57.6 %)

Torsion of draining vein

Positive

50 (65.8 %)

42 (9.8 %)

<0.001

Negative

26 (34.2 %)

385 (91.2 %)

Number of medullary veins

5.91 ± 0.33

3.52 ± 0.08

<0.001

Stenosis rate of draining vein

53.66 ± 1.87 %

47.79 ± 0.68 %

<0.001

Stenosis rate of medullary veins

54.68 ± 1.85 %

43.65 ± 0.87 %

<0.001

Length of draining vein(mm)

21.45 ± 0.95

16.36 ± 0.40

<0.001

Angle of draining vein(°)

106.50 ± 3.84

136.62 ± 3.84

<0.001