Table 3 Results of multivariate logistic regression for training cohort and internal test cohort

Sex

female

-

-

-

-

male

1.74

1.36, 2.23

< 0.001

1.93

1.34, 2.77

< 0.001

Age

0.94

0.93, 0.96

< 0.001

0.96

0.94, 0.98

< 0.001

Tumor location

upper

-

-

-

-

middle

2.58

1.56, 4.53

< 0.001

1.14

0.60, 2.28

0.702

lower

2.59

1.48, 4.73

0.001

1.55

0.77, 3.26

0.226

multifocal

3.97

2.45, 6.88

< 0.001

2.24

1.24, 4.34

0.011

Tumor size

9.21

5.10, 16.76

< 0.001

9.06

3.79, 21.98

< 0.001

HT

present

-

-

-

-

absent

1.54

1.14, 2.11

0.006

2.12

1.32, 3.56

0.003

Microscopic capsular invasion

absent

-

-

-

-

present

1.44

1.13, 1.83

0.003

1.50

1.05, 2.16

0.027