Table 1 Comparison of clinical characteristics between L-PLADC and D-PLADC

Age (years)

 Means ± standard deviations

62 ± 9

61 ± 11

0.404^a

 Range

35–62

23–84

Sex

 Male

43/131 (32.8%)

72/117 (61.5%)

< 0.001^b

 Female

88/131 (67.2%)

45/117 (38.5%)

Smoking

 Non-smokers

97/131 (74.0%)

52/117 (44.4%)

< 0.001^b

 Smokers

34/131 (26.0%)

65/117 (55.6%)

Respiratory symptoms

 Fever

7/131 (5.3%)

9/117 (7.7%)

0.452^b

 Cough

54/131 (41.2%)

103/117 (88.0%)

< 0.001^b

 Sputum

42/131 (32.1%)

77/117 (65.8%)

< 0.001^b

 Blood in sputum

13/131 (9.9%)

13/117 (11.1%)

0.761^b

 Hemoptysis

8/131 (6.1%)

11/117 (9.4%)

0.330^b

 Chest pain

16/131 (12.2%)

13/117 (11.1%)

0.787^b

 No symptoms

62/131 (47.3%)

5 /117 (4.3%)

< 0.001^b

Laboratory results

 Elevation of white blood cell count

13/131 (9.9%)

41/117 (35.0%)

0.003^b

 Elevation of C-reactive protein level ^c

10/32 (31.3%)

66/84 (78.6%)

< 0.001^b