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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-.