Table 1 Demographic characteristics of the participants

No. of subjects

105

374

–

Gender, M, n (%)

66 (62.9)

252 (69.6)

0.171

Age, years

63.2 ± 12.4

65.3 ± 13.2

0.192

BMI, kg/m²

23.26 ± 3.13

21.37 ± 2.48

 < 0.01

Smoking history, n (%)

30 (28.6)

200 (53.5)

 < 0.01

Smoking index (pack-yr)

19.2 ± 20.4

42.8 ± 25.7

 < 0.01

Airway diseases, n (%)

–

81 (21.7)

–

Lung infections, n (%)

–

104 (27.8)

–

Respiratory failure, n (%)

–

37 (9.9)

–

NSCLC, n (%)

–

128 (34.2)

–

Others, n (%)

–

24 (6.4)

–

WBC counts (1.0 × 10⁹)

–

7.5 ± 3.6

–

Neu counts (1.0 × 10⁹)

–

5.5 ± 5.1

–

Platelets (1.0 × 10⁹)

–

233.9 ± 85.9

–

Albumin (g/L)

–

38.5 ± 5.3

–

Hemoglobin (g/L)

–

123.1 ± 21.7

–

Days in hospital (day)

–

8.5 ± 5.3

–

Medical costs (CNY)

–

13,472 ± 12,143

–