Table 3 Gas exchange values

PaO₂ (mmHg)

VCV

296 ± 30

291 ± 30

269 ± 17

266 ± 24

−5.6 [−19.2 to 7.9], 0.9539

−27.7 [−41.3 to − 14.2], <  0.0001

−30.5 [− 44.1 to − 17.0], <  0.0001

PCV-VG

296 ± 27

297 ± 32

270 ± 17

268 ± 20

1.1 [− 12.3 to 14.5], >  0.9999

− 26.2 [− 39.5 to − 12.8], <  0.0001

−28.6 [− 41.9 to − 15.2], <  0.0001

Mean diff [95% CI]

0.5 [− 14.2 to 15.2]

−6.2 [− 20.9 to 8.5]

− 1.1 [− 15.8 to 13.6]

−1.4 [− 16.1 to 13.3]

P

>  0.9999

>  0.9999

>  0.9999

>  0.9999

“

PaCO₂ (mmHg)

VCV

37.8 ± 1.1

39.8 ± 2.5

42.3 ± 2.5

43.1 ± 3.2

1.9 [0.6 to 3.3], 0.0016

4.4 [3.1 to 5.8], <  0.0001

5.3 [3.9 to 6.6], <  0.0001

PCV-VG

37.9 ± 1.0

40.0 ± 2.8

41.3 ± 2.6

42.6 ± 3.0

2.1 [0.8 to 3.4], 0.0006

3.4 [2.1 to 4.7], <  0.0001

4.7 [3.4 to 6.1], <  0.0001

Mean diff [95% CI]

−0.0 [−1.5 to 1.4]

− 0.2 [−1.6 to 1.3]

1.0 [− 0.4 to 2.5]

0.5 [− 0.9 to 1.9]

P

>  0.9999

>  0.9999

0.2841

>  0.9999

OI

VCV

99 ± 20

69 ± 11

64 ± 10

62 ± 10

−39.7 [−50.5 to −29.9], <  0.0001

−46.5 [− 56.2 to − 36.7], <  0.0001

− 49.6 [− 59.4 to − 39.9], <  0.0001

PCV-VG

95 ± 17

71 ± 13

65 ± 11

64 ± 11

−32.2 [− 41.8 to − 22.6], <  0.0001

−40.4 [− 50.1 to − 30.8], <  0.0001

−41.6 [− 51.2 to − 31.9], <  0.0001

Mean diff [95% CI]

5.0 [−5.5 to 15.4]

− 2.5 [− 12.9 to 7.9]

−1.1 [− 11.5 to 9.4]

− 3.1 [− 13.5 to 7.4]

P

0.9286

>  0.9999

>  0.9999

>  0.9999

V_d/V_T (%)

VCV

37.1 ± 2.9

39.6 ± 4.1

42.0 ± 3.7

42.3 ± 3.4

2.7 [0.7 to 4.7], 0.0036

4.8 [2.9 to 6.8], <  0.0001

5.3 [3.3 to 7.3], <  0.0001

PCV-VG

37.1 ± 2.7

39.3 ± 4.5

40.9 ± 3.1

42.1 ± 3.9

2.2 [0.2 to 4.1], 0.0265

3.8 [1.8 to 5.7], < 0.0001

4.9 [2.9 to 6.9], <  0.0001

Mean diff [95% CI]

−0.0 [−2.1 to 2.1]

0.5 [− 1.5 to 2.6]

1.1 [− 1.0 to 3.1]

0.3 [− 1.7 to 2.4]

P

>  0.9999

>  0.9999

0.8145

>  0.9999