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Table 1 Patient characteristics of the specimens examined by immunohistochemistry

From: Glutathione-S-transferases in lung and sputum specimens, effects of smoking and COPD severity

  Non-smoker
N = 16
Smoker
N = 22
COPD
N = 34
p-value
Age, years 65 (13) 63 (8) 62 (9) 0.543
Sex M:F 8:8 17:5 27:7 0.103
Pack-years 0 46 (19)* 38 (13)§ 0.000
FEV1 %predicted 98 (15) 90 (10) 55 (23)*# 0.000
FEV1/FVC % 86 (9) 83 (11) 56 (15)*# 0.000
MEF50 %pred 94 (24) 80 (37) 34 (21)*# 0.000
DCO %pred 91 (15) 78 (14) 64 (27)§ 0.004
DCO/VA %pred 89 (11) 83 (12) 72 (24) § 0.035
  1. Mean (SD)
  2. *The mean difference between non-smokers and smokers is significant at the 0.05 level, Dunnett t-test.
  3. §The mean difference between non-smokers and COPD-patients is significant at the 0.05 level, Dunnett t-test.
  4. # The mean difference between smokers and COPD-patients is significant at the 0.05 level, Dunnett t-test.