Table 3 Univariate analysis of risk factors for skip metastasis in PTC patients

Sex (male/female)

9/35

105/229

2.23

0.136

Age(≧ 55 years/< 55 years)

8/36

34/300

2.52

O.112

Age

44.48 ± 12.56

39.37 ± 11.51

2.74

0.006

Multifocality (yes/no)

7/37

77/257

1.15

0.284

Bilaterality (yes/no)

16/28

101/233

0.68

0.409

Primary tumor location upper/middle/lower

28/9/7

64/171/99

41.93

< 0.001

HT (yes/no)

9/35

78/256

0.18

0.668

ETE (yes/no)

8/36

61/273

0.001

0.989

Capsule invasion (yes/no)

11/33

84/258

0.001

0.983

Tumor extension (T1/T2/T3/T4)

23/7/12/2

196/41/71/26

1.87

0.6

Primary tumor size ≦ 1 cm (yes/no)

24/20

118/216

6.12

0.013

Total tumor size/cm

1.31 ± 0.87

1.59 ± 0.97

1.79

0.075

Number of central dissected lymph nodes

6.47 ± 4.59

7.65 ± 5.14

1.46

0.144

Number of lateral dissected lymph nodes

16.89 ± 10.12

18.44.47 ± 12.98

0.77

0.439