Table 1 Clinical characteristics

Age, years

62.32 ± 7.72

60.26 ± 9.54

Male, n (%)

24 (42.9)

15 (26.3)

Smoking history, n (%)

10 (17.9)

6 (10.5)

Resected lobe

 Right upper lobe

16

11

 Right middle lobe

5

3

 Right lower lobe

6

8

 Left upper lobe

18

15

 Left lower lobe

9

6

 Others

2

14

Interval between two operations (month)

10.51 (4.17–24.73)

3.57 (1.62–8.92)

Preoperative

 preFVC (L)

2.92 ± 0.59

3.04 ± 0.77

 preFEV1 (L)

2.41 ± 0.56

2.48 ± 0.67

Postoperative

 postFVC (L)

2.58 ± 0.58

2.76 ± 0.71

 postFEV1 (L)

2.05 ± 0.51

2.24 ± 0.61

 FVC loss (%)

11.39 ± 13.52

8.16 ± 13.33

 FEV1 loss (%)

14.37 ± 13.66

8.65 ± 12.58