Table 4 Univariate analysis by Cox’s proportional hazards method for disease-free survival

Age (years)

1.112(0.395–3.130)

0.840

Male gender

5.676(2.034–15.839)

0.001

ETE

0.041(0.000–40.879)

0.365

Diameter of the largest tumor

1.688(0.601–4.743)

0.321

Sum diameter of all tumors

9.072(2.533–32.491)

0.001

Foci number

2.191(0.697–6.886)

0.179

Primary tumor laterality

0.889(0.322–2.452)

0.820

TNM stage

1.131(0.386–3.312)

0.822

With chronic thyroiditis

1.638(0.369–7.261)

0.516

CLNM

4.951(1.114–21.998)

0.036