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. 2023 Jul 13;23:357. doi: 10.1186/s12887-023-04176-x

Table 4.

BPD incidence rate and its severity grades according to years

2016
(n = 66)
2017
(n = 63)
2018
(n = 61)
2019
(n = 85)
2020
(n = 41)
P value
Overall BPD incidence rate

25

(38%)

33

(52%)

29

(47.5%)

49

(58%)

19

(46%)

0.14
BPD incidence rate based on severity grades
Grade 1

9

(36%)

23

(70%)

21

(72%)

33

(67%)

13

(68%)

0.01
Grade 2

12

(48%)

2

(6%)

4

(14%)

8

(16%)

4

(21%)

0.30
Grade 3

4

(16%)

8

(24%)

4

(14%)

8

(16%)

2

(11%)

0.80