Table 3 Multivariate regression analysis for the Pulmonary Metastasis Prediction Model

Pathologic N category

 0

Reference

 1

0.992

 2

1.831

 3

3.196

Number of IPNs

  < 3

Reference

  ≥ 3

3.317

Shape of the largest IPN

 Round or round-like

2.355

 Others

Reference

Time of detection of IPNs(year)

  < 1

Reference

 1–2

1.476

  > 2

1.659

Size of the largest IPN

  < 5 mm

Reference

 5–10 mm

3.274

 10–30 mm

4.482

  > 30 mm

6.341