Table 2 Demographic and computed tomography scan characteristics of the study population

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