Case | Age at presentation yrs | Occupation | Smoking status | Atopy# | Previous asthma¶ | First exposure to first symptoms yrs |
1 | 42 | Swimming instructor | Never | Yes | Yes | 10 |
2 | 33 | Lifeguard | Never | Yes | Until age 11 yrs | 14 |
3 | 49 | Lifeguard | Exsmoker | No | No | 12 |
4 | 44 | Industrial chemist | Exsmoker 10 pack-yrs | No | No | 3 |
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#: Defined as at least one weal of ≥3 mm following skin-prick testing to common environmental allergens
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¶: Previous asthma, patient or general practitioner report of chest tightness or wheeze improving with inhaled bronchodilators or steroids