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Table 1 Demographics of study participants

From: Smoking reduces surfactant protein D and phospholipids in patients with and without chronic obstructive pulmonary disease

  Never Smoker (N = 65) Smokers (N = 45)
   Control (N = 23) COPD (N = 22)
Age 28 ± 8 53 ± 5 64 ± 9
Sex (m/f) 36/29 18/5 14/8
Current Smokers 0% 78% 41%
Pack Years 0 36 ± 14 60 ± 29
FEV1 post bronchodilator (l) 4.2 ± 0.9 3.2 ± 0.7 1.7 ± 0.7
FEV1 (% predicted) 103% ± 11% 95% ± 13% 56% ± 21%
FEV1/FVC 0.85 ± 0.06 0.79 ± 0.05 0.53 ± 0.12
  1. Shown are means ± standard deviations; P values in text