Multivariate association(adjusted per centre) between asthma score (five items) at follow-up and follow-up characteristics in all the participants, expressed in ratio of mean asthma score (RMS)
| RMS (95% CI) | |
| NO2 (per each increase of 10 μg·m−3) | 1.23 (1.09–1.38) |
| Females | 1.28 (1.10–1.49) |
| Age at ECRHS II yrs | |
| ≤35 | 1.00 |
| 35–40 | 1.14 (0.91–1.43) |
| 40–45 | 1.02 (0.81–1.29) |
| 45–50 | 1.00 (0.80–1.27) |
| >50 | 1.13 (0.89–1.42) |
| Social class at ECRHS II# | |
| I–II | 1.00 |
| III nonmanual | 1.18 (1.00–1.39) |
| III manual | 0.95 (0.71–1.26) |
| IV–V | 1.28 (0.99–1.65) |
| Unclassified | 1.28 (0.96–1.69) |
| Atopy at ECRHS II | 1.64 (1.42–1.89) |
| Family history of asthma or atopy | 1.40 (1.22–1.61) |
| Smoking at ECRHS II | |
| Never | 1.00 |
| Former | 1.17 (0.98–1.40) |
| Current | 1.27 (1.04–1.56) |
| Smoking pack-years | 1.00 (1.00–1.01) |
| Exposure to second-hand tobacco smoke at ECRHS II | 1.23 (1.06–1.43) |
| FEV1 at ECRHS II % pred | 0.98 (0.97–0.98) |
ECRHS: European Community Respiratory Health Survey; FEV1: forced expiratory volume in 1 s; % pred: % predicted. #: for definitions of social class, see table 2⇑. Entries in bold are statistically significant.