Table 2 Univariate and multivariate cox analyses to evaluate the prognostic factors for OS

Age

< 0.001

 30–49

Reference

Reference

 50–69

1.146

0.928–1.414

0.205

1.198

0.969–1.480

0.095

 ≥ 70

1.626

1.310–2.019

< 0.001

1.767

1.421–2.198

< 0.001

Race

0.060

 White

Reference

Reference

 Black

1.000

0.873–1.144

0.997

0.962

0.839–1.103

0.579

 Others

0.776

0.630–0.955

0.016

0.734

0.595–0.905

0.004

Sex

0.030

 Male

Reference

Reference

 Female

0.911

0.837–0.992

0.0311

0.887

0.8135–0.966

0.006

T stage

< 0.001

 T0

Reference

Reference

 T1

1.449

0.970–2.164

0.070

1.343

0.898–2.008

0.151

 T2

1.582

1.074–2.330

0.020

1.451

0.984–2.140

0.060

 T3

1.830

1.242–2.698

0.002

1.664

1.127–2.456

0.010

 T4

1.775

1.210–2.603

0.003

1.623

1.104–2.387

0.014

N stage

< 0.001

 N0

Reference

Reference

 N1

0.964

0.795–1.168

0.707

0.931

0.768–1.129

0.469

 N2

1.242

1.090–1.414

0.001

1.230

1.079–1.402

0.002

 N3

1.236

1.068–1.431

0.005

1.220

1.052–1.415

0.009

Marriage

< 0.001

 Unmarried

Reference

Reference

 Married

0.862

0.792–0.938

< 0.001

0.851

0.780–0.928

< 0.001