Table 3 Univariate analysis of factors associated with SLN identification by logistic regression

Female sex

7.5 [1.85–50.95]

0.01

Age

0.93 [0.86–1]

0.06

Smoking

0.4 [0.06–1.71]

0.27

DLCO (%)

Low (≤ 75)

Ref

-

High (> 75)

6.61 [1.84–31.73]

0.01

FEV1/FVC (%)

Low (≤ 70)

Ref

-

High (> 70)

2.73 [0.86–9.71]

0.1

FEV1 (%)

Low (≤ 93)

Ref

-

High (> 93)

3.09 [0.98–10.98]

0.06

Degree of emphysema

Light-moderate

Ref

-

Severe

0.18 [0.05–0.59]

0.005

Extent of operation

Lobectomy

Ref

-

Segmentectomy

0.59 [0.19–1.8]

0.36

Nodule density

Subsolid

Ref

-

Solid

0.45 [0.06–1.94]

0.33

Tumor size (cm)

≤ 1 cm

Ref

1.1 − 2 cm

0.26 [0.01–1.73]

0.23

2.1 − 3 cm

0.1 [0–0.68]

0.04

≥ 3.1 cm

0.25 [0.01–3.12]

0.29

N+

1.86 [0.27–37.1]

0.58

Visceral pleural invasion

0.87 [0.17–6.53]

0.88

Vascular invasion

0.86 [0.24–3.54]

0.82