Outcome measures of health status, lung function and quality of life
| Outcome measure | Subjects n | Mean±sd |
| SF-12 PCS | 404 | 44.8±10.9 |
| Asthma severity score | 404 | 6.9±5.4 |
| FEV1 % predicted# | 218 | 85.1±18.1 |
| Asthma QoL score¶ | 340 | 16.2±14.7 |
SF-12 PCS: Short Form-12 Physical Component Scale; FEV1: forced expiratory volume in one second; % pred: % predicted; QoL: quality of life. #: only available among subjects completing a study home visit; ¶: available for subjects with asthma only (one subject missing data).