Reference values for diurnal variation in peak expiratory flow(PEF) and forced expiratory volume in one second (FEV1) using home spirometry with electronic data storage
| Subjects n | Amplitude of variation % mean | ||||
| PEF | FEV1 | ||||
| Mean (95% CI) | 95th percentile | Mean (95% CI) | 95th percentile | ||
| 6–11 yr olds | |||||
| Female | 51 | 7.3 (6.4–8.2) | 12.3 | 6.1 (5.4–6.8) | 11.8 |
| Male | 50 | 6.9 (6.1–7.7) | 10.4 | 6.6 (5.8–7.4) | 9.8 |
| 12–16 yr olds | |||||
| Female | 53 | 5.8 (5.0–6.7) | 12.2 | 5.2 (4.5–5.9) | 8.5 |
| Male | 50 | 4.9 (4.3–5.6) | 8.0 | 5.1 (4.3–6.0) | 8.5 |
| Total | 204 | 6.2 (5.8–6.7) | 12.3 | 5.7 (5.4–6.1) | 11.8 |
CI: confidence interval.