Phenotypic features of genotyped siblings having bronchial hyperresponsiveness in the Epidemiological study on the Genetics and Environment of Asthma (EGEA), Saguenay–Lac-Saint-Jean (SLSJ) asthma study and Southampton asthma family cohort (SOTON) asthma-ascertained families
| EGEA | SLSJ | SOTON | |
| Subjects | 304 | 145 | 382 |
| Age years | 16.1 (15.2–17.0) | 20.3 (18.6–22.0) | 10.6 (8.0–13.8) |
| Females | 43.4 (132) | 52.4 (76) | 44.5 (170) |
| Asthma | 59.5 (181) | 95.2 (138) | 94.8 (362) |
| Age at asthma onset years | 7.4 (6.3–8.6) | 9.4 (7.7–11.0) | 4.4 (4.0–4.7) |
| Atopy | 76.0 (228) | 85.8 (121) | 77.5 (296) |
| ETS exposure | 57.9 (176) | 64.1 (93) | 29.8 (114) |
Data are presented as n, mean (95% CI) or % (n). ETS: environmental tobacco smoke.