Table 4 Logistic regression analysis of the significant risk factors in association with CLNM

Final pathological factors

Gender (M/F)

1.578

0.592

0.008 ^a

4.848

1.519–15.466

Age (<50y/≥50y)

1.236

0.428

0.004^a

3.442

1.488–7.963

Tumor size (≥7 mm/<7 mm)

1.067

0.419

0.011^a

2.908

1.278–6.614

Multifocality

0.991

0.667

0.138

2.693

0.728–9.956

Bilateral PTMC

0.436

0.484

0.367

1.547

0.600–3.993

Constant

−1.787

0.448

Preoperative factors

Gender (M/F)

1.591

0.596

0.008^a

4.910

1.526–15.796

Age (<50y/≥50y)

1.199

0.424

0.005^a

3.311

1.443–7.634

Preoperative tumor size (≥ 7 mm/<7 mm)

1.086

0.418

0.009^a

2.964

1.305–6.729

Preoperative multifocality

0.806

0.706

0.253

2.240

0.562–8.931

Bilateral PTMC

0.584

0.466

0.210

1.793

0.719–4.469

Constant

−0.600

0.371