Table 3 Multivariate survival analysis of the patients following operation for gastric cancer before and after PSM

Age (> 60 vs ≤ 60 years)

1.315

1.189–1.455

 < 0.001

-

-

-

Tumor size (> 5 vs ≤ 5 cm)

1.202

1.063–1.361

0.003

1.338

1.016–1.761

0.038

Type of gastrectomy

0.013

-

-

-

 Proximal vs distal

1.198

1.018–1.411

0.030

-

-

-

 Total vs distal

1.398

1.115–1.753

0.004

-

-

-

T stage

 < 0.001

-

-

 T2 vs T1

1.505

1.171–1.935

0.001

-

-

-

 T3 vs T1

1.644

1.282–2.108

 < 0.001

-

-

-

 T4a vs T1

2.406

1.906–3.038

 < 0.001

-

-

-

 T4b vs T1

2.670

2.021–3.527

 < 0.001

-

-

-

N stage

 < 0.001

-

-

 < 0.001

 N1 vs N0

1.464

1.215–1.764

 < 0.001

3.034

1.272–7.237

0.012

 N2 vs N0

1.911

1.599–2.283

 < 0.001

2.683

1.153–6.242

0.022

 N3a vs N0

3.116

2.620–3.707

 < 0.001

5.764

2.520–13.186

 < 0.001

 N3b vs N0

3.842

3.152–4.682

 < 0.001

7.578

3.286–17.472

 < 0.001

Chemotherapy (present vs absent)

0.667

0.598–0.745

 < 0.001

0.759

0.621–0.929

0.007

TD (presence vs absence)

1.286

1.118–1.478

0.001

1.268

1.057–1.522

0.011