Group

Number of cases

Gender

age

Onset location (case)

Female

male

Left

Right

CTC positive group

29

13

16

54.8 ± 1.1

17

12

CTC negative group

24

11

13

53.1 ± 0.9

14

10

χ² value

0.516

6.279

t value

−2.451

P value

0.383

0.09

0.30