Tracheal intubation

Tracheotomy

0˚

20˚

40˚

60˚

90˚

90˚

Ventilation*

0.78

0.78

0.43

1.00

0.54

0.98

Control method†

1.00

0.34

0.45

0.53

0.45

0.40

Catheter‡

0.25

0.002

<0.001

<0.001

<0.001

<0.001

PEEP§

0.62

0.71

0.07

0.009

0.34

0.08