Group

Case (n)

M/F

Age(year）

Type Ⅱa

Type Ⅱb

Type Ⅱc

Observation

75

38/37

53.74±11.03

31

27

17

Control

75

39/36

54.12±10.58

30

29

16

Statistical value

χ2=2.14

t=1.241

T=1565.5

P value

P=0.351

P=0.286

P=0.149