Table 4 Multivariate analysis of factors that contributed to PTC recurrence in the training and testing sets

Training set (n=414)

  Serum fibrinogen levels (high vs low)

3.152

1.781-5.882

0.002

  T classification

4.117

1.340-9.831

<0.001

  N classification

1.682

1.132-2.862

0.046

  M classification

11.681

5.684-32.391

<0.001

Testing set (n=609)

  Serum fibrinogen levels (high vs low)

2.891

1.201-4.874

0.032

  T classification

3.872

1.227-10.862

0.001

  N classification

1.621

1.201-2.984

0.042

  M classification

13.772

4.823-28.910

<0.001