Variables and range used for computation of the paw score standardisation using quartile range
| Points on paw score | ||||
|---|---|---|---|---|
| Variables | 0 | 1 | 2 | 3 |
| PaO2 (mm Hg) | ≥64.5 | (51.5–64.4) | (46.5–51.4) | <46.5 |
| %CSA<5 | <0.313 | (0.313–0.432) | (0.433–0.547) | ≥0.548 |
| WT | <1.095 | (1.095–1.179) | (1.180–1.324) | ≥1.325 |
WT, mean wall thickness; %CSA<5, percentage of total lung area taken up by the cross-sectional area of pulmonary vessels less than 5 mm2.