Demographic details of the asthmatic and nonasthmatic populations
| Phenotype | Subjects n | Females | Age yrs | Atopy | Ever smoked | % pred FEV1# | ICS use¶ | ICS dose+ µg·day−1 | OCS use§ | Frequency of OCS use mean times·yr−1 | |
| Current | Past | ||||||||||
| Asthma | 643 | 61.1 | 49.1±15.3 | 83.0 | 3.9 | 33.6 | |||||
| Mild | 316 | 58.9 | 47.7±15.1 | 84.2 | 1.9 | 36.1 | 92.0±16.8 | 62.3 | 591.9±39.5 | 5.5 | 1.2 |
| Moderate | 241 | 64.3 | 50.6±15.9 | 82.6 | 6.2 | 32.4 | 74.4±21.2 | 93.7 | 1,423.8±68.7 | 38.8 | 1.4 |
| Severe | 86 | 60.5 | 50.1±14.4 | 80.2 | 4.7 | 27.9 | 59.8±22.9 | 97.6 | 2,674.7±157.1 | 80.0 | 2.9 |
| AIA | 58 | 63.8 | 46.9±13.7 | 81.0 | 3.4 | 31.0 | 79.6±21.5 | 89.6 | 1,589.6±207.2 | 48.9 | 2.2 |
| Nonasthma | 477 | 55.3 | 51.4±14.1 | 50.9 | 6.7 | 39.8 | 100.9±15.7 | ||||
Data are presented as mean±sd or %, unless otherwise indicated. FEV1: forced expiratory volume in one second; ICS: inhaled corticosteroid; OCS: oral corticosteroid; #: data for FEV1 was available for 310 mild, 237 moderate and 83 severe asthmatic patients, 48 aspirin-intolerant asthmatic (AIA) patients and 471 nonasthmatic subjects; ¶: data for ICS use (beclomethasone equivalent dose) was available for 310 mild, 237 moderate and 85 severe asthmatic, and 48 AIA patients; +: data are presented as mean±sem; §: data for OCS use was available for 309 mild, 237 moderate and 85 severe asthmatic, and 47 AIA patients.