Table 1.
Demographics of asthma and chronic obstructive pulmonary disease (COPD) patients stratified by smoking status. Data are expressed in number of patients, mean ± standard deviation or median and range for non-normal distributions.
| Asthma and COPD Patients | Ever Smokers (n = 593) | Never Smokers (n = 303) | p-Value |
|---|---|---|---|
| Age (mean (SD)) | 60.99 (13.38) | 48.46 (18.04) | <0.001 |
| BMI (mean (SD)) | 27.78 (5.82) | 26.95 (6.69) | 0.055 |
| Gender = M/F (%) | 48.6/51.4 | 37.3/62.7 | 0.002 |
| Allergy = Yes/No (%) | 42.0/58.0 | 69.6/30.4 | <0.001 |
| FEV (mean (SD)) (l) | 2.04 (0.89) | 2.62 (0.93) | <0.001 |
| FVC (mean (SD)) (l) | 3.41 (1.07) | 3.66 (1.13) | 0.002 |
| FEV1/FVC (mean (SD)) (%) | 56 (16) | 70 (14) | <0.001 |
| FEV1 pred (mean (SD)) (%) | 70.93 (23.81) | 86.14 (21.74) | <0.001 |
| ACQ (median [IQR]) | 1.60 [0.86, 2.50] | 1.43 [0.71, 2.29] | 0.208 |
| CCQ (median [IQR]) | 1.00 [0.00, 2.30] | 0.00 [0.00, 0.00] | <0.001 |
| Current use of ICS = No/Yes (%) | 27.8/72.2 | 15.5/84.5 | <0.001 |
| Oral corticosteroids (%) | 0.780 | ||
| Current use | 2.4 | 1.7 | |
| Previous use | 10.3 | 10.6 | |
| No | 87.4 | 87.8 |
BMI: body mass index; ACQ: asthma control questionnaire; CCQ: clinical COPD questionnaire; ICS: inhaled corticosteroids.