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Table 1 Characteristics of the study population (N = 591): data are median [Q1-Q3]

From: Association between occupational exposure and the clinical characteristics of COPD

  All n = 591 VDGF + n = 209 (35%) VDGF - n = 382 (65%) P
Male/female ratio (%) 80.7/19.3 89.9/9.1 75.6/24.4 <0.001 (a)
Age 65 [57–73] 68 [59–74] 64 [57–72] 0.0005 (b)
Smoking status
Current/past (%)
27/73 22/78 29/71 0.04 (a)
Smoking, pack-yr 41 [26–58] 39 [20–54] 42 [28–60] 0.01 (b)
Hay fever 11 15.5 8.5 <0.01 (a)
Life-time atopic dermatitis 7 8 .8 6.1 NS (a)
Life-time asthma 11.3 14.7 9.5 0.0614 (a)
  1. (a) = Chi-Square Test.
  2. (b) = Wilcoxon rank-sum test.
  3. p values are for differences between VGDF + and VGDF-.