TABLE 3.
Relationship of the model variables with oximetry. In a total of 1578 radiographs, the association of these variables was analyzed by means of multiple linear regression with the figures obtained in pulse oximetry. Estimated parameters of the models. Standard errors in brackets. AUC = area under the curve, where the target is “Extreme” or “Low” saturation.
| Estimates | p-value | |
|---|---|---|
| Age | 0.0081 (0.0008) | <0.0001 |
| Sex | −0.1329 (0.0283) | <0.0001 |
| Lung area | −1.2367 (0.1858) | <0.0001 |
| Pulmonary air density | −0.3690 (0.2188) | 0.0919 |
| Opacity area | 0.8272 (0.1446) | <0.0001 |
| Train: Number of observations | 1578 | - |
| Train: RMSE | 0.505 | - |
| Train: AUC (Extreme or Low) | 0.736 | - |
| Test: Number of observations | 374 | - |
| Test: RMSE | 0.603 | - |
| Test: AUC (Extreme or Low) | 0.724 | - |