Table 1 General characteristics between common resolution and delayed resolution groups

Age, years

6.00 (4.00, 9.00)

7.00 (5.25, 8.00)

0.172

Male

42 (50.6%)

32 (47.1%)

0.665

History of asthma

1 (1.2%)

2 (2.9%)

0.589

History of rhinitis

5 (6.0%)

5 (7.4%)

0.755

Passive smoke exposure

13 (15.7%)

6 (8.8%)

0.207

Fever duration before intervention, d

6.00 (2.00, 6.00)

7 (4.00, 10.00)

< 0.001

Cough duration before intervention, d

7.00 (4.00, 10.00)

6.00 (4.00, 7.00)

0.506

Cough type

0.091

 Dry cough

29 (34.9%)

33 (48.5%)

 Productive cough

54 (65.1%)

35 (51.5%)

Dyspnea

4 (4.8%)

2 (2.9%)

0.691

Decreased breath sounds

9 (10.8%)

9 (13.2%)

0.652

Lung lobe consolidation

0.966

 1/3 ~ 2/3

71 (85.5%)

58 (85.3%)

 > 2/3

12 (14.5%)

10 (14.7%)

WBC, ×10⁹/L

7.80 (6.80, 9.40)

7.75 (6.00, 9.61)

0.819

CRP, mg/L

7.50 (2.70, 18.70)

45.05 (13.00, 57.08)

< 0.001

Neutrophil count, ×10⁹/L

4.95 (3.52, 6.42)

5.02 (3.52, 6.61)

0.503

LDH, U/L

285.00 (246.00, 334.00)

353.50 (306.00, 466.00)

< 0.001

PaO₂, mmHg

77.61 (67.39, 90.85)

79.32 (70.00, 90.38)

0.833

PaCO₂, mmHg

40.49 (37.40, 42.12)

40.50 (37.89, 43.06)

0.512

IL-6, pg/ml

29.66 (16.93, 37.87)

32.16 (22.78, 42.02)

0.147

IL-10, pg/ml

6.90 (6.43, 7.39)

7.11 (6.47, 7.56)

0.223

IL-17 A, pg/ml

22.95 (16.28, 30.06)

24.02 (17.36, 32.38)

0.410

D-dimer, µg/ml

0.49 (0.32, 1.02)

3.17 (1.88, 4.67)

< 0.001

Atelectasis

19 (22.9%)

18 (26.5%)

0.611

Time to BAL intervention, d

5.00 (4.00, 5.00)

9.00 (7.00, 10.00)

< 0.001

Length of hospital stay, d

7.00 (7.00, 9.00)

12.00 (10.00, 15.75)

< 0.001