Table 3 The relationship between demographic and clinical variables and survival

Gender (Female)

0.94

(0.61–1.45)

0.770

Age (≥ 65)

0.86

(0.58–1.28)

0.461

Smoking history (Yes)

0.99

(0.64–1.54)

0.974

ECOG PS (1–2)

1.07

(0.54–2.13)

0.837

Primary site (Right)

0.73

(0.49–1.07)

0.105

Histology(Squamous cell carcinoma and others)

1.55

(0.99–2.42)

0.056

Degree of differentiation (High)

1.19

(0.76–1.85)

0.456

Stage (IV)

0.70

(0.40–1.24)

0.225

Extrapulmonary metastasis (Yes)

1.50

(1.02–2.22)

0.042

1.68

(1.10–2.55)

0.016

Tumor size (≥ 5(cm))

1.57

(1.02–2.40)

0.041

1.43

(0.93–2.21)

0.100

BT1 cfDNA (≥ 15(ng/mL))

1.97

(1.29–3.01)

0.002

1.98

(1.26–3.11)

0.003

NLR (≥ 2.98)

1.57

(1.06–2.32)

0.024

1.86

(1.22–2.84)

0.004