Venturi before (No. =)

Venturi after (No. =)

Paired t-test

Mean

SD

Mean

SD

T

P-value

PH

7.403

0.095

7.393

0.099

1.530

0.142

PCO2

36.15

9.080

38.7

11.805

−2.091

0.050

HCO3

22.5

3.501

23.25

3.611

−5.251

0.000

PO2

65.25

12.353

80.75

24.174

−3.568

0.002

SO2

89.95

3.017

93.25

4.689

−3.789

0.001