Table 3 Multivariate Cox regression analysis for OS of 142 patients with NPC

  Male vs. Female

0.225

0.053–0.950

0.042*

0.247

0.075–0.819

0.022*

   < 46 vs. ≥46

1.389

0.673–2.867

0.374

2.099

1.027–4.293

0.042*

  T1 + T2 vs. T3 + T4

0.873

0.292–2.611

0.809

0.972

0.325–2.905

0.959

  N0-1 vs. N2-3

2.312

0.969–5.519

0.050*

2.662

1.146–6.187

0.023*

  1 + 2 vs. 3 + 4

0.798

0.327–1.945

0.619

0.856

0.284–2.579

0.783

  Yes vs. NO

2.296

1.013–5.204

0.047*

23.877

9.554–59.668

0.000*

  Yes vs. No

9.085

1.871–44.128

0.006*

5.045

1.195–21.288

0.028*

  NKUC vs. NKDC

0.680

0.148–3.121

0.620

0.580

0.129–2.609

0.477

   ≤ 1:10 vs. >1:10

0.568

0.234–1.381

0.212

0.679

0.275–1.677

0.401

   ≤ 1:40 vs. >1:40

0.613

0.207–1.816

0.377

0.376

0.131–1.084

0.070

  Low vs. High

0.802

0.330–1.947

0.626

0.520

0.213–1.267

0.150

  Low vs. High

1.649

0.612–4.443

0.323

1.450

0.602–3.490

0.407

   > 1 vs. ≤1

0.298

0.096–0.920

0.035*

0.334

0.115–0.969

0.044*