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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).
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