Regression equations for single breath washout indices from the core dataset (n=120)
| Adjusted R2 | Residual, standard, deviation | ||
| SnIII_FRC (/litre) | |||
| Women | e (0.0227 * age – 0.583 * FRC + 2.08 * height – 5.955) | 0.60 | 0.297 |
| Men | e (0.0363 * age –0.537 * FRC − 2.644) | 0.72 | 0.357 |
| SnIII_RV (/litre) | |||
| Men/women | 0.000646 * age + 0.00534 * FRC + 0.0372 | 0.18 | 0.016 |
| SIII_RV (%/litre) | |||
| Women | e (0.0204 * age – 0.726) | 0.29 | 0.342 |
| Men | e (0.0285 * age – 1.325) | 0.48 | 0.307 |
Age in years, height in metres, and FRC in litres.
FRC, functional residual capacity; SnIII_FRC, SnIII_RV, normalised phase III slope of a single breath washout maneuver starting from functional residual capacity or residual volume; SIII_RV, unnormalised phase III slope of a single breath washout maneuver starting from residual volume.