Repeatability (Cintra) and reproducibility (Cinter) of spirometry, calculated using absolute values, in healthy children and those with asthma from lung function measured on the first visit before and after receiving placebo
| Healthy children (n=181) | Children with asthma (n=124) | |||||
|---|---|---|---|---|---|---|
| Spirometry | Cintra (%) | Cinter (%) | p Value | Cintra (%) | Cinter (%) | p Value |
| FVC | 12.0 | 12.3 | 0.699 | 12.9 | 18.2 | 0.117 |
| FEV1 | 11.6 | 11.9 | 0.711 | 11.8 | 19.3 | 0.220 |
| FEV0.75 | 11.8 | 11.9 | 0.891 | 12.1 | 23.0 | 0.108 |
| FEV0.5 | 12.1 | 12.3 | 0.812 | 12.1 | 24.2 | 0.034 |
Within-session repeatability (Cintra) calculated from children randomised to receive placebo inhalation on visit 1; between-session reproducibility (Cinter) calculated from baseline spirometry performed at each visit.