Table 1 Baseline characteristics of health control, stable COPD patients, AECOPD patients and lung cancer patients

Age (year)

67.1 ± 10.2

67.4 ± 6.3

68.6 ± 8.1

69.6 ± 9.4

Gender (male/female)

18/10

22/16

15/9

36/21

BMI (kg/m2)

22.8 ± 4.1

22.1 ± 3.3

22.6 ± 2.8

22.1 ± 3.8

Smoke history

(Yes/No)

11/17

22/16

15/9

31/26

Type of cancer

/

/

/

Non-small cell lung cancer

FEV1 (L)

1.99 ± 0.41

0.97 ± 0.45^*

1.00 ± 0.47^*

0.98 ± 0.37^*

FEV1(% predicted)

93.6 ± 7.4

42.2 ± 14.9^*

44.2 ± 13.8^*

41.5 ± 5.8^*

FEV1/FVC (%)

77.6 ± 3.1

47.8 ± 13.2^*

49.5 ± 11.3^*

47.8 ± 8.2^*