Venturi before

(No. = 20)

Venturi after

(No. = 20)

Paired t-test

Mean

SD

Mean

SD

T

P-value

Heart rate

107.50

8.751

103.40

12.365

2.732

0.013

Respiratory rate

22.1

4.051

20.1

4.229

4.414

0.000

Systolic blood pressure

144.50

22.355

137.50

26.926

1.629

0.02

Diastolic blood pressure

86

10.954

85

13.179

0.567

0.577