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Table 1 The characteristics of the patients

From: Ageing and smoking contribute to plasma surfactant proteins and protease imbalance with correlations to airway obstruction

Variable

Young

Middle aged/elderly

 

Non-smokers

Smokers

Non-smokers

Smokers

COPD

Number

36

51

40

64

44

Age (yr)

19.5 (0.8)

20.0 (1.0)

53.3 (8.8)

52.1 (8.0)

61.3 (8.5)

Sex (F/M)

2/34

1/50

28/12

24/40

9/35

Pack-years

-

5.1 (2.3)

-

30.4 (14.3)

39.8 (15.0)

BMI

24.1 (2.5)

24.1 (3.1)

26.5 (4.2)

27.7 (4.0)

26.9 (3.8)

Post- bronchodilator

FVC (l)

5.5 (0.8)

5.5 (0.8)

3.8 (0.8)

4.0 (0.9)

3.8 (0.9)

FEV1 (l)

4.8 (0.7)

4.8 (0.7)

3.2 (0.6)

3.3 (0.7)

2.3 (0.7)

FEV1

(% predicted)

97.3 (6.1)

100.1 (9.5)

104.7 (13.6)

95.3 (12.2)

70.0 (16.8)

FEV1/FVC

87.6 (5.6)

87.1 (4.8)

84.5 (5.9)

82.7 (5.1)

60.6 (9.3)

  1. COPD: chronic obstructive pulmonary disease; BMI: body mass index; FVC: forced vital capacity; FEV1: forced expiratory volume in one second. Data is shown as mean (SD).