Table 3 Univariate and multivariate analysis for PFS before and after PSM

Treatment

CRT-S

0.008

0.463

0.017

0.459

0.026

0.463

0.049

0.488

D-CRT

0.258–0.831

0.242–0.869

0.231–0.929

0.238–0.997

Age, years

 ≤ 60

0.020

0.570

0.119

0.671

0.001

0.312

0.009

0.372

 > 60

0.354–0.920

0.406–1.108

0.151–0.642

0.176–0.785

Sex

Male

0.142

0.561

0.121

0.236

Famale

0.257–1.227

0.032–1.727

KPS score

 > 80

0.149

0.647

0.056

0.422

 ≤ 80

0.357–1.174

0.170–1.050

Smoking status

Ever

0.088

1.603

0.036

2.664

0.034

2.864

Never

0.927–2.771

1.027–6.914

1.081–7.589

Smoking index

 < 850

0.056

1.956

0.016

4.079

0.224

2.203

 ≥ 850

0.969–3.948

1.174–14.169

0.616–7.881

Drinking index

 > 4500

0.025

0.579

0.022

0.569

0.113

0.565

 ≤ 4500

0.357–0.938

0.351–0.924

0.276–1.157

T stage

T4a

0.169

1.386

0.117

1.172

T4b

0.868–2.215

0.866–3.385

N stage

N0

N1

N2

N3

0.224

1.197

0.913–1.568

0.323

1.014

0.644–1.594

Segment

Cervical

Upper

Middle

Lower

0.815

0.885

0.672–1.164

0.427

1.022

0.581–1.798

Weight loss

Yes

0.757

0.927

0.800

0.913

No

0.575–1.495

0.450–1.852