Morning and evening forced expiratory volume in 1 s(FEV1) expressed and diurnal FEV1 change among 182 asthmatic children, by season during the study period
| Variables | Mean±sd | 1st quartile | Median | 3rd quartile |
| FEV1 % pred | ||||
| Morning | 83.8±18.1 | 73.5 | 85.3 | 95.3 |
| Evening | 84.5±18.3 | 74.0 | 85.8 | 95.9 |
| Diurnal FEV1 change# % | 2.28±17.4 | -5.6 | 0.4 | 7.6 |
% pred: % predicted. #: expressed as 100×(FEV1 bedtime − FEV1 morning)/FEV1 morning.