Association of pre-exercise % predicted FEV1 with respiratory symptoms and asthma
| Children without symptoms | Children with symptoms | ||||||
|---|---|---|---|---|---|---|---|
| N | Mean % of predicted value (95% CI) | N | Mean % of predicted value (95% CI) | Difference in means (95% CI) | p Value | ||
| At any time: | |||||||
| Asthma | 714 | 104.4 (103.3 to 105.6) | 79 | 100.1 (96.7 to 103.6) | 4.3 (0.7 to 8.0) | 0.019 | |
| Bronchospasm | 653 | 104.6 (103.5 to 105.8) | 140 | 101.1 (98.0 to 104.2) | 3.5 (0.7 to 6.4) | 0.015 | |
| Bronchodilator therapy2-151 | 623 | 104.8 (103.6 to 105.9) | 141 | 101.0 (98.2 to 103.7) | 3.8 (1.0 to 6.6) | 0.007 | |
| Asthma to bronchospasm or bronchodilator therapy | 629 | 104.7 (103.6 to 105.9) | 164 | 101.4 (98.5 to 104.2) | 3.4 (0.7 to 6.0) | 0.014 | |
| In the last 12 months (numbers refer to question numbers in table 1): | |||||||
| (1) Wheeze2-152 | 717 | 104.4 (103.3 to 105.5) | 75 | 100.3 (96.2 to 104.3) | 4.1 ( 0.4 to 7.8) | 0.029 | |
| (2) Chest tightness | 719 | 104.5 (103.4 to 105.6) | 74 | 99.5 (94.7 to 104.3) | 4.9 (1.2 to 8.7) | 0.009 | |
| (3) Agitated breathing | 704 | 104.8 (103.7 to 105.9) | 89 | 97.8 (93.4 to 102.1) | 7.1 (3.6 to 10.5) | <0.001 | |
| (4) Waking with tight chest | 766 | 104.2 (103.2 to 105.3) | 27 | 97.4 (89.8 to 105.1) | 6.8 (0.8 to 12.8) | 0.026 | |
| (5) Shortness of breath | 722 | 104.6 (103.5 to 105.7) | 71 | 97.8 (92.9 to 102.6) | 6.9 (3.1 to 10.6) | <0.001 | |
| (6) Waking with shortness of breath | 748 | 104.4 (103.3 to 105.5) | 45 | 97.9 (91.8 to 104.0) | 6.5 (1.8 to 11.2) | 0.007 | |
| (7) Waking with cough2-152 | 516 | 104.0 (102.7 to 105.3) | 276 | 104.2 (102.2 to 106.1) | –0.1 (–2.4 to 2.1) | 0.915 | |
| (8) Asthma attack | 763 | 104.3 (103.2 to 105.4) | 30 | 96.2 (88.2 to 104.3) | 8.1 (2.4 to 13.8) | 0.005 | |
| Any respiratory symptom of asthma2-150 | 609 | 105.3 (104.1 to 106.4) | 184 | 99.9 (97.1 to 102.7) | 5.3 (2.8 to 7.9) | <0.001 | |