| ever asthma and CB (n=296) | CB without ever asthma (n=733) | ever asthma without CB (n=609) | allergic rhinitis only (n=949) | other respiratory conditions (n=1,455) | no respiratory problem (n=3,068) | |
| ED visits/hospital admissions | 15.9% | 13.7% | 11.4% | 9.8% | 10.5% | 5.9% |
| working days lost | 31.5% | 21.3% | 22.4% | 20.4% | 20.1% | 12.9% |
*adjusted for gender, age, season of response, type of contact, cumulative response rate, and centre