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Table 1 Demographic characteristics of studied groups.

From: Exhaled volatile organic compounds in patients with non-small cell lung cancer: cross sectional and nested short-term follow-up study

  NSCLC COPD Controls Smokers
Subjects (n°) 36 25 50 35
Age (median, years) 67.2 70.2 55.7 54.1
Sex (male/female) 28/8 18/7 27/23 30/5
Current smokers 2 1 0 35
Ex smokers 28 21 0 0
Ever smokers 6 3 50 0
*Pack-years 20 20 n.a. 25 ± 2.6
FEV1 (% predicted) 69.8 ± 15.2 61.7 ± 13.4 105.6 ± 9.1 101.8 ± 10.2
  1. The ex-smokers subjects had stopped smoking for at least one year. * Pack-years (mean ± SD) among current smokers. NSCLC = non-small cell lung cancer; COPD = chronic obstructive pulmonary disease; n.a. = not applicable.