Group 1

Ventilator

(N = 29)

Group 2

CPAP

(N = 33)

Group 3

Headbox

(N = 28)

One-way ANOVA

Mean

SD

Mean

SD

Mean

SD

F

P-value

Cortisol level (mg/dl)

39.22

9.91

28.96

6.48

25.88

5.42

25.131

0.001