Table 7. Parameter estimates from simple linear regression analysis of percent (%) predicted values of forced expiratory volume in 1 second (FEV1) in relation to the scoring of radiographic abnormalities and other factors.
| Variables | Parameter estimates (95% CI) | P value | Adjusted R-squared |
|---|---|---|---|
| Scoring of radiographic abnormalities | -3.29 (-4.14 to -2.44) | 0.000 | 0.31 |
| Education (years of study) | -0.532 (-1.47 to 0.41) | 0.263 | 0.0021 |
| Smoking status (former vs. never) | 2.83 (-6.57 to 12.24) | 0.552 | -0.0051 |
| Pack-years of smoking | -1.183 (-3.59 to 1.23) | 0.325 | -0.0001 |
| Comorbidity | 3.29 (-0.33 to 6.90) | 0.074 | 0.0174 |
| Time of the disease (days) | -0.03 (-0.07 to 0.01) | 0.090 | 0.0251 |
| MRC Dyspnea Scale | |||
| MRC 1 | -4.48 (-13.44 to 4.48) | 0.324 | 0.0921 |
| MRC 2 | -9.74 (-22.10 to 2.62) | 0.121 | |
| MRC 3 | -38.90 (-60.12 to -17.67) | 0.000 | |
| MRC 4 | -41.30 (-87.11 to 4.52) | 0.077 | |
| Oxygen pulse saturation | 1.38 (0.34 to 2.42) | 0.009 | 0.0451 |