Table 4.

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

Variables	Odds ratio	95% CI	P value
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