Comparison between included and not included subjects for the follow-up analysis in 2003–2004
| Total | Included subjects | Not included subjects | p-value | |
| Subjects n | 551 | 199 | 352 | |
| Males | 274 (49.7) | 106 (53.3) | 168 (47.7) | 0.21 |
| Age yrs | 29.8±3.2 | 30.1±3.2 | 29.6±3.2 | 0.10 |
| Baseline assessment# | ||||
| Asymptomatic¶ | ||||
| No AHR | 205 (37.2) | 76 (38.2) | 129 (36.6) | |
| AHR | 133 (24.1) | 47 (23.6) | 86 (24.4) | 0.96 |
| Symptomatic¶ | ||||
| No AHR | 114 (20.7) | 42 (21.1) | 72 (20.5) | |
| AHR+ | 99 (18.0) | 34 (17.1) | 65 (18.5) | |
| Asthma diagnosis§ | 134 (24.3) | 47 (23.6) | 87 (24.7) | 0.77 |
| Allergicƒ | 163 (33.1) | 76 (41.1) | 87 (28.3) | 0.004 |
Data are presented as n (%) or mean±sd, unless otherwise stated. AHR: airway hyperresponsiveness. #: in 1989; ¶: according to questionnaire; +: all these subjects were classified as having asthma according to the criteria used in the present study; §: diagnosis by general practitioner or at baseline assessment; ƒ: Phadiatop test during baseline assessment, available for 492 (89%) of the subjects in the baseline cohort.