Table 2.
Results.
| Linear Regression | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| ROI | PEEP 12 | PEEP 9 | PEEP 6 | PEEP 3 | PEEP 0 | m | k | R2 | p | ||
| Entire slice | ASext (voxels) | ALL | 17.3 ± 1.1 | 17.4 ± 1 | 17.3 ± 1 | 17.1 ± 1 | 16 ± 2.1 | 0.11 | 16.3 | 0.09 | <0.01 |
| ASden (n/mm3) | ALL | 233.5 ± 15.6 | 230.6 ± 14 | 229.1 ± 14.4 | 224.7 ± 14.3 | 216.7 ± 15.2 | 1.47 | 217.01 | 0.14 | <0.01 | |
| Regional analysis | ASext (voxels) | SUB | 16.6 ± 0.8 | 17 ± 0.9 | 16.8 ± 1 | 16.8 ± 1 | 16 ± 1.9 | 0.05 | 16.26 | 0.04 | 0.3 |
| MAN | 16.9 ± 0.7 | 16.9 ± 0.7 | 16.9 ± 0.7 | 16.8 ± 0.8 | 15.8 ± 1.9 | 0.09 | 16.07 | 0.1 | 0.06 | ||
| COR | 18.3 ± 1 | 18.3 ± 0.9 | 18.1 ± 0.9 | 17.8 ± 1 | 16.2 ± 2.7 | 0.18 | 16.56 | 0.19 | <0.01 | ||
| ASden (n/mm3) | SUB | 245.8 ± 8.4 | 239 ± 9.4 | 238.2 ± 10.5 | 234.7 ± 8.8 | 223.3 ± 12.7 | 1.86 | 223.6 | 0.39 | <0.01 | |
| MAN | 239.4 ± 7.3 | 238.9 ± 5.1 | 236.9 ± 5 | 231.8 ± 5.7 | 224.9 ± 10.9 | 1.33 | 225.39 | 0.38 | <0.01 | ||
| COR | 215.4 ± 9.5 | 214 ± 7.5 | 212.1 ± 7.3 | 207.7 ± 7.5 | 201.9 ± 10.5 | 1.21 | 202.04 | 0.27 | <0.01 | ||
Airspaces extension (ASext) and density (ASden) at different levels of PEEP [reported as (cmH2O); data expressed for the whole analyzed slice and for the three regions of interests (SUB, subpleural; MAN, mantellar; COR, core]. Values expressed as mean ± SD.