Table 1 The components of the clinical index used as the primary outcome measure

Oxygen saturation

%

By pulse oximetry

At t1, t2, and every subsequent 3rd hour

≥ 96

2

90–95

1

≤ 89

0

Oxygen concentration

%

At t1, t2, and every subsequent 3rd hour

21

4

22–30

3

31–40

2

41–50

1

≥ 51

0

High nasal flow

Litres/kg/min

At t1, t2, and every subsequent 3rd hour

0

2

0.1–1

1

1.1–2

0

Oral fluid intake

%^a

g (weight when breast feeding) or ml (by bottle)

At every feeding session

100

3

51–99

2

1–50

1

0

0