Table 4 Cox proportional hazard regression of risk factors for tumor-progression with pulmonary-vascular-stump filling defect

Gender:

 Male

Reference

 Female

1.92 (0.85–4.36)

0.137

Age, years:

 ≤ 64

Reference

 >64

0.86 (0.41–1.8)

0.692

Histological types:

 Non-small cell

Reference

Reference

Reference

 Small cell

1.3(0.41–4.54)

0.610

0.71(0.42–0.83)

0.400

1.27(0.38–4.30)

0.696

Stage of cancer at surgery:

 Stage I/II

Reference

Reference

Reference

 Stage III/IV

2 (0.96–4.17)

0.070

1.18(0.38–1.55)

0.120

0.81(0.38–1.75)

0.592

Surgical intervention:

 Right side

Reference

 Left side

0.75 (0.36–1.56)

0.439

Location:

 Pulmonary artery stump

Reference

 Pulmonary vein stump

0.50 (0.17–1.43)

0.200

Shape:

 Convex shape

Reference

Reference

Reference

 Concave shape

0.43 (0.21–0.91)

0.026

0.46(0.39–1.99)

0.040

0.46(0.39–1.99)

0.757

Attenuation(Hounsfield unit)

 ≤ 38

Reference

 >38

1.52 (0.69–3.35)

0.295

Findings at follow-up:

 Stabilization or regression

Reference

 Increased

5.8 (2.67–12.62)

< 0.001

0.26(0.11–0.65)

0.004