Table 3 Univariate and multivariate analyses of factors for CSS after PSM using a Fine-Gray hazard model

Age, years

 < 65

Reference

Reference

 >  = 65

1.76

1.22

2.54

0.002

1.77

1.20

2.62

0.004

Race

 Black

Reference

Reference

 White

0.53

0.32

0.86

0.010

0.49

0.29

0.80

0.005

 Others or Unknown

0.79

0.45

1.40

0.422

0.88

0.50

1.55

0.655

Year of diagnosis

 2004–2008

Reference

Reference

 2009–2013

0.78

0.56

1.10

0.154

0.74

0.52

1.05

0.087

 2014–2017

0.49

0.33

0.71

 < 0.001

0.61

0.41

0.91

0.014

Tumor size, mm

 <  = 40

Reference

Reference

 > 40, <  = 60

1.26

0.89

1.78

0.187

1.83

1.29

2.59

0.001

 > 60

1.63

1.09

2.44

0.018

1.68

1.11

2.53

0.014

Grade

 Well differentiated

Reference

Reference

 Moderately differentiated

1.29

0.80

2.07

0.291

1.13

0.71

1.81

0.608

 Poorly differentiated

2.02

1.24

3.31

0.005

1.47

0.89

2.43

0.133

 Undifferentiated; anaplastic

2.57

1.41

4.71

0.002

2.18

1.16

4.11

0.016

 Unknown

2.54

1.48

4.35

0.001

1.71

0.99

2.96

0.055

FIGO stage

 IB3/IIA2-IIB

Reference

Reference

 III

2.53

1.85

3.46

 < 0.001

0.80

0.37

1.72

0.569

 IVA

3.79

1.75

8.22

0.001

6.01

2.43

14.85

 < 0.001

T stage

 T1

Reference

Reference

 T2

1.83

1.29

2.61

0.001

1.84

1.29

2.63

0.001

 T3

3.38

2.17

5.26

 < 0.001

3.87

2.27

6.60

 < 0.001

 T4

3.67

1.66

8.07

0.001

—

—

—

—

N stage

 N0

Reference

Reference

 N1

2.20

1.64

2.95

 < 0.001

2.66

1.34

5.30

0.005

Chemotherapy

 No

Reference

—

 Yes

1.18

0.78

1.78

0.426

—

—

—

—

Local treatment

 Primary RT

Reference

Reference

 Surgery + PORT

0.73

0.54

1.00

0.050

0.69

0.50

0.95

0.022