Severity of RDS by Down’s score

N.

%

Types of respiratory support

Cortisol level mg/dl

One-way ANOVA

Ventilator

CPAP

Headbox

F

P-value

Mild

30

33.3

0

2

28

25.51

20.185

0.001

Moderate

31

34.4

5

26

0

30.39

Severe

29

32.2

24

5

0

38.28