Group

Number of cases

Gender (example)

age

Onset location (case)

Female

male

Left

Right

CTC positive group

33

15

18

54.9 ± 1.2

19

14

CTC negative group

32

15

17

52.1 ± 0.8

17

15

χ² value

0.406

6.079

t value

−2.311

P value

0.273

0.09

0.30