Table 4 Univariate and multivariate analyses of the prognostic factors for CSS after PSM

Year of diagnosis

  2004–2010

1.000

  2011–2015

1.190

0.754—1.879

0.454

Age, years

 < 65

1.000

 ≥ 65

1.185

0.794—1.768

0.407

Sex

 Male

1.000

 Female

1.190

0.762—1.857

0.445

Race

 White

1.000

0.173

 Black

1.829

0.971—3.444

0.061

 Other

1.036

0.478—2.244

0.929

Tumor grade

 I

1.000

0.799

 II

1.296

0.585—2.874

0.523

 III

1.269

0.555—2.902

0.573

 Other

0.973

0.369—2.566

0.956

Histology

 SCC

1.000

0.045

1.000

0.010

 AD

0.396

0.113—0.847

0.013

0.396

0.191—0.821

0.013

 Other

0.000

0.000—1.305

0.971

0.000

0.000—1.563

0.971

T stage

 T 1

1.000

0.057

1.000

0.125

 T 2

1.663

0.787—3.512

0.183

1.608

0.756—3.413

0.217

 T 3

1.901

1.042—3.468

0.036

1.686

0.915—3.108

0.094

 T 4

2.253

1.272—3.990

0.005

2.035

1.137—3.640

0.017

 N stage

 N0

1.000

 N1

1.155

0.735—1.814

0.531

Treatment

 RS

1.000

1.000

 CRT

0.829

0.556—1.236

0.358

0.767

0.512—1.149

0.198