Table 1 Definitions of BPD

2018 NICHD definition

Grade

IMV

NCPAP, NIPPV, or nasal cannula ≥ 3 L/min

Nasal cannula (1 ~ < 3) L/min or hood O₂

Nasal cannula < 1 L/min

I

-

21

22–29

22–70

II

21

22–29

≥ 30

> 70

III

> 21

≥ 30

-

-

III(A)

Death from respiratory causes between 14 days after birth and 36 weeks’ PMA.

2019 Jensen definition

1

Nasal cannula ≤ 2 L/min

2

Nasal cannula > 2 L/min, nCPAP, or NIPPV

3

IMV