Table 2.
Main results.
| Parameters of Linear Regression | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| ROI | PEEP 12 | PEEP 9 | PEEP 6 | PEEP 3 | PEEP 0 | m | k | R2 | p | ||
| Entire slice | ASdim (voxel) | ALL | 13.1 ± 2.2 | 11.1 ± 4.3 | 9 ± 5.7 | 8 ± 5.5 | 7.6 ± 4.3 | 0.55 | 6.03 | 0.21 | <0.01 (*) |
| ASnum (n/mm3) | ALL | 188 ± 52.0 | 163.2 ± 86.3 | 145.2 ± 92.3 | 142.4 ± 104.9 | 146.4 ± 96.7 | 5.96 | 116.41 | 0.08 | 0.02 (*) | |
| Regional analysis | ASdim (voxel) | SUB | 13.6 ± 1.8 | 13 ± 2.8 | 10.9 ± 4.1 | 9.9 ± 4.6 | 9.4 ± 3.6 | 0.41 | 8.54 | 0.22 | 0.02 (*) |
| MAN | 12.9 ± 1.8 | 11.2 ± 3.5 | 9.1 ± 5.5 | 7.9 ± 5.4 | 7.4 ± 3.6 | 0.55 | 5.95 | 0.27 | <0.01 (*) | ||
| COR | 12.9 ± 2.9 | 9.1 ± 5.9 | 6.9 ± 7.6 | 6.3 ± 6.9 | 5.9 ± 5.5 | 0.68 | 3.61 | 0.21 | 0.02 (*) | ||
| ASnum (n/mm3) | SUB | 189.7 ± 56.7 | 174.9 ± 93.3 | 158.7 ± 98.6 | 160.4 ± 114.1 | 162.5 ± 109.8 | 4.85 | 136.21 | 0.05 | 0.28 | |
| MAN | 193.0 ± 55.5 | 167.0 ± 90.9 | 152.3 ± 96.6 | 145.6 ± 109.7 | 149.7 ± 100.2 | 6.15 | 120.16 | 0.09 | 0.15 | ||
| COR | 181.2 ± 55.5 | 144.7 ± 91.7 | 124.6 ± 99.8 | 121.3 ± 111.7 | 127.1 ± 99.1 | 6.89 | 92.86 | 0.10 | 0.12 | ||
Values expressed as mean ± SD; ROI= region of interest; PEEP = positive end-expiratory pressure; ASdim = airspaces average dimension; ASnum = airspaces density.