The corrected equations for predicted values for the median (M), the variability around the median (S) and the skewness (L) for each of the TLCO test outcomes (transfer factor of the lung for carbon monoxide (TLCO), transfer coefficient of the lung for carbon monoxide (KCO) and alveolar volume (VA))
| M | S | L | |
| Male | |||
| TLCO mmol·min-1·kPa-1 | exp(-8.129189 + 2.018368·ln(height) - 0.012425·ln(age) + Mspline) | exp(-1.98996 + 0.03536·ln (age) + Sspline) | 0.39482 |
| DLCO mL·min-1·mmHg-1 | exp(-7.034920 + 2.018368·ln(height) - 0.012425·ln(age) + Mspline) | ||
| KCO (SI) mmol·min-1·kPa-1·L-1 | exp(2.994137 - 0.415334·ln(height) - 0.113166·ln(age) + Mspline) | exp(-1.98186 + 0.01460·ln(age) + Sspline) | 0.67330 |
| KCO (trad) mL·min-1·mmHg-1·L-1 | exp(4.088408 - 0.415334·ln(height) - 0.113166·ln(age) + Mspline) | ||
| VA L | exp(-11.086573 + 2.430021·ln(height) + 0.097047·ln(age) + Mspline) | exp(-2.20953 + 0.01937·ln(age) + Sspline) | 0.62559 |
| Female | |||
| TLCO mmol·min-1·kPa-1 | exp(-6.253720 + 1.618697·ln(height) - 0.015390·ln(age) + Mspline) | exp(-1.82905 - 0.01815·ln(age) + Sspline) | 0.24160 |
| DLCO mL·min-1·mmHg-1 | exp(-5.159451 + 1.618697·ln(height) - 0.015390·ln(age) + Mspline) | ||
| KCO (SI) mmol·min-1·kPa-1·L-1 | exp(4.037222 - 0.645656·ln(height) - 0.097395·ln(age) + Mspline) | exp(-1.63787 - 0.07757·ln(age) + Sspline) | 0.48963 |
| KCO (trad) mL·min-1·mmHg-1·L-1 | exp(5.131492 - 0.645656·ln(height) - 0.097395·ln(age) + Mspline) | ||
| VA L | exp(-9.873970 + 2.182316·ln(height) + 0.082868·ln(age) + Mspline) | exp(-2.08839 - 0.01334·ln(age) + Sspline) | 0.51919 |
Mspline, Sspline correspond to the age-varying coefficients from the look-up tables provided in the supplementary material. Height and age are expressed as cm and years, respectively. Predicted value: M; lower limit of normal (5th percentile): exp(ln(M) + ln(1 - 1.645·L·S)/L); upper limit of normal (5th percentile): exp(ln(M) + ln(1 + 1.645·L·S)/L); z-score: ((measured/M)L - 1)/(L·S); % predicted: (measured/M)·100; exp: natural exponential; ln: natural logarithm. This table has been amended in the article originally published in the September 2017 issue of the European Respiratory Journal.