Table 2 Neonatal and infant mortality risks and population attributable fraction (PAF) by gestational age and birthweight strata

Neonatal deaths

213

3.6 (3.2, 4.1)

GA 25-27 (week)

28

518.5 (401.0, 670.5)

365.50 (255.23, 523.40)^***

13.11

28-31

43

181.1 (140.2, 234.0)

127.68 (89.22, 182.70)^***

22.35

32-36

33

15.0 (10.7, 21.1)

10.60 (6.95, 16.15)^***

14.03

37-38

41

3.2 (2.3, 4.3)

2.24 (1.51, 3.32)^***

10.66

39-41

61

1.4 (1.1, 1.8)

1.00 (Reference)

>  42

2

3.2 (0.8, 12.7)

2.25 (0.55, 9.16)

0.52

BW < 1000 (g)

25

735.3 (601.0, 899.6)

392.47 (294.56, 522.92)^***

11.70

1000-1499

44

207.5 (159.5, 270.0)

110.78 (79.41, 154.55)^***

20.46

1500-2499

46

28.7 (21.6, 38.2)

15.33 (10.80, 21.76)

20.18

2500-3999

92

1.9 (1.5, 2.3)

1.00 (Reference)

>  4000

6

0.7 (0.3, 1.6)

0.40 (0.17, 0.90)^*

−4.27

Infant deaths

291

4.9 (4.4, 5.5)

GA 25-27 (week)

34

629.6 (513.2, 772.5)

246.12 (186.59, 324.64)^***

11.63

28-31

52

196.2 (153.8, 250.4)

76.70 (56.43, 104.26)^***

17.62

32-36

37

16.9 (12.2, 23.2)

6.59 (4.55, 9.54)^***

10.78

37-38

55

4.3 (3.3, 5.5)

1.67 (1.21, 2.30)^**

7.60

39-41

110

2.6 (2.1, 3.1)

1.00 (Reference)

>  42

3

4.8 (1.5, 14.8)

1.87 (0.60, 5.86)

0.48

BW < 1000 (g)

28

823.5 (704.9, 926.2)

271.41 (217.07, 339.36)^***

9.59

1000-1499

50

235.8 (185.1, 300.5)

77.73 (58.13, 103.94)^***

16.96

1500-2499

51

31.8 (24.3, 41.7)

10.49 (7.66, 14.36)^***

15.85

2500-3999

149

3.0 (2.6, 3.6)

1.00 (Reference)

>  4000

13

1.6 (0.9, 2.8)

0.53 (0.30, 0.93)^*

−3.97