Table 3.
Linear regression model coefficients for adult spirometry parameters
| Regression Coefficients (P value) |
|||||
|---|---|---|---|---|---|
| Pulmonary Function Test | α0 | α1 (age dependence) | α2 (height2 dependence) | α3 (h dependence) | Model P Value |
| FEV1, liter | 2.5 ± 1.4 (0.093) | −0.046 ± 0.007 (1.1E-6) | (1.5 ± 0.2) E-4 (4.53E-6) | −0.012 ± 0.006 (0.042) | 1.6E-8 |
| FVC, liter | 2.4 ± 2.0 (0.23) | −0.044 ± 0.009 (0.00014) | (2.0 ± 0.3) E-4 (8.8E-6) | −0.016 ± 0.008 (0.047) | 7.1E-7 |
| FEV1/FVC, % | 2.2 ± 1.9 (<2E-16) | −0.25 ± 0.07 (0.0015) | 1.5E-3 | ||
Values are means ± SD. Lung function parameter = α0 + α1 age + α2 height2 + α3 h (age in years, height in cm, alveolar depth h at FRC in μm). Significant P values are given in bold.