Correlations of within pair case compared to smoking control ratios of each spirometric index
| Correlations4-150 of within pair case:control ratios of each spirometric index | ||||||||
|---|---|---|---|---|---|---|---|---|
| FVC | FEV1 | FEF20–75 | FEF20–50 | FEF50–75 | FEF60–80 | FEF75–85 | FEF80–90 | |
| FEV1 | 0.87 | – | ||||||
| FEF20–75 | 0.73 | 0.92 | – | |||||
| FEF20–50 | 0.69 | 0.89 | 0.91 | – | ||||
| FEF50–75 | 0.70 | 0.87 | 0.97 | 0.80 | – | |||
| FEF60–80 | 0.69 | 0.83 | 0.92 | 0.72 | 0.97 | – | ||
| FEF75–85 | 0.66 | 0.73 | 0.79 | 0.60 | 0.84 | 0.92 | – | |
| FEF80–90 | 0.60 | 0.64 | 0.67 | 0.48 | 0.73 | 0.83 | 0.93 | – |
| FEF85–95 | 0.44 | 0.39 | 0.38 | 0.20 | 0.46 | 0.57 | 0.66 | 0.81 |
For abbreviations see footnote to table 2.
↵4-150 Pearson correlation coefficients derived from log transformed ratios.