Table 2 Cutoff values for the number of metastatic lymph nodes analyzed by Cox proportional hazard model

1 vs. ≥2

2.758

1.457 (0.932-2.278)

0.099

2 ≤ vs. ≥3

5.706

1.599 (1.084-2.359)

0.018

3 ≤ vs. ≥4

4.042

1.486 (1.008-2.191)

0.046

4 ≤ vs. ≥5

8.854

1.804 (1.209-2.692)

0.004

5 ≤ vs. ≥6

19.610

2.542 (1.658-3.898)

<0.001

6 ≤ vs. ≥7

20.903

2.820 (1.774-4.482)

<0.001

7 ≤ vs. ≥8

15.544

2.269 (1.597-4.330)

<0.001

8 ≤ vs. ≥9

6.543

2.070 (1.171-3.660)

0.012

9 ≤ vs. ≥10

6.696

2.189 (1.191-4.023)

0.012

10 ≤ vs. ≥11

2.698

1.766 (0.888-3.514)

0.105