Table 2.
Demographic and computed tomography scan characteristics of the study population
| Population | Males | Females | P value | |
|---|---|---|---|---|
| Patients (n) | 100 | 53 | 47 | |
| Patient weight (kg) | 72 ± 14 | 78 ± 14 | 64 ± 11 | <0.0001 |
| Patient height (m) | 1.7 ± 0.1 | 1.7 ± 0.1 | 1.6 ± 0.1 | <0.0001 |
| Body mass index (kg/m²) | 25 ± 4 | 26 ± 4 | 24 ± 4 | 0.02 |
| Age (years) | 64 ± 13 | 63 ± 12 | 65 ± 14 | 0.64 |
| Total lung volume (ml) | 4,995 ± 1,313 | 5,757 ± 1,127 | 4,136 ± 923 | <0.0001 |
| Lung right | 2,667 ± 691 | 3,063 ± 594 | 2,219 ± 492 | <0.0001 |
| Lung left | 2,329 ± 659 | 2,694 ± 589 | 1,917 ± 466 | <0.0001 |
| Lung gas volume (ml) | 4,066 ± 1,190 | 4,729 ± 1,033 | 3,319 ± 875 | <0.0001 |
| Lung right | 2,174 ± 627 | 2,521 ± 545 | 1,784 ± 464 | <0.0001 |
| Lung left | 1,892 ± 593 | 2,208 ± 534 | 1,535 ± 436 | <0.0001 |
| Lung weight (g) | 929 ± 188 | 1,029 ± 168 | 817 ± 140 | <0.0001 |
| Lung right | 492 ± 100 | 542 ± 89 | 435 ± 79 | <0.0001 |
| Lung left | 435 ± 94 | 484 ± 86 | 380 ± 68 | <0.0001 |
| Over inflated tissue (%) | 11 ± 7 | 12 ± 6 | 9 ± 7 | 0.03 |
| Lung right | 11 ± 7 | 12 ± 7 | 9 ± 8 | 0.05 |
| Lung left | 10 ± 7 | 12 ± 6 | 9 ± 7 | 0.04 |
| Normal inflated tissue (%) | 65 ± 8 | 64 ± 8 | 66 ± 8 | 0.12 |
| Lung right | 65 ± 8 | 64 ± 8 | 66 ± 9 | 0.14 |
| Lung left | 65 ± 8 | 64 ± 8 | 66 ± 9 | 0.10 |
| Poorly inflated tissue (%) | 18 ± 3 | 18 ± 3 | 18 ± 3 | 0.84 |
| Lung right | 18 ± 3 | 18 ± 3 | 18 ± 3 | 0.92 |
| Lung left | 18 ± 3 | 18 ± 3 | 18 ± 4 | 0.99 |
| Not inflated tissue (%) | 7 ± 4 | 6 ± 4 | 7 ± 4 | 0.53 |
| Lung right | 6 ± 4 | 6 ± 3 | 7 ± 4 | 0.56 |
| Lung left | 7 ± 4 | 7 ± 4 | 7 ± 4 | 0.74 |
| Lung density (HU) | -805 ± 48 | -816 ± 33 | -792 ± 58 | 0.01 |
| Lung right | -808 ± 46 | -819 ± 32 | -796 ± 56 | 0.01 |
| Lung left | -804 ± 49 | -815 ± 34 | -791 ± 60 | 0.02 |
| Average superimposed pressure (cm H2O) | 2.6 ± 0.5 | 2.6 ± 0.6 | 2.6 ± 0.6 | 0.4 |
| Lung right | 2.6 ± 0.6 | 2.7 ± 0.5 | 2.6 ± 0.6 | 0.65 |
| Lung left | 2.7 ± 0.5 | 2.7 ± 0.4 | 2.6 ± 0.6 | 0.32 |
| Transverse plane size (mm) | 279 ± 27 | 298 ± 18 | 257 ± 17 | <0.0001 |
| Lung right | 155 ± 29 | 165 ± 29 | 143 ± 25 | <0.001 |
| Lung left | 136 ± 16 | 145 ± 12 | 127 ± 13 | <0.0001 |
| Coronal plane size (mm) | 200 ± 22 | 214 ± 19 | 185 ± 13 | <0.0001 |
| Lung right | 197 ± 22 | 210 ± 20 | 182 ± 13 | <0.0001 |
| Lung left | 194 ± 21 | 206 ± 18 | 179 ± 13 | <0.0001 |
| Sagittal plane size (mm) | 261 ± 26 | 270 ± 23 | 250 ± 25 | <0.001 |
| Lung right | 254 ± 28 | 264 ± 24 | 243 ± 28 | <0.001 |
| Lung left | 253 ± 28 | 262 ± 26 | 243 ± 28 | <0.001 |
HU, Hounsfield units.