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) |