Table 4 Multivariate Cox regression model for predictors of time to attain FEF in LBW neonates admitted to neonatal intensive care unit of Addis Ababa public hospitals, Ethiopia, 202

Educational level

No education

52 (24.64)

30 (42.25)

1

1

Primary

56 (26.54)

15 (21.12)

1.27

0.78

0.541

0.405 1.52

Secondary

44 (20.85)

6 (8.45)

2.2

2.05

0.030*

1.08 4.68

Technical

19 (9.0)

10 (14.08)

1.5

1.22

0.509

0.436 3.45

Higher

40 (18.9)

10 (14.08)

2.22

2.17

0.047*

1.012 4.6

Gestational age

28–31

40 (19)

26 (36.6)

0.29

0.82

0.718

0.276 2.4

32–37

134 (63.5)

32 (45)

0.636

0.91

0.835

0.38 2.16

≥ 37

35 (16.5)

8 (11)

1

1

Birth weight in gram

2000–2499

75 (35.5)

17 (24)

1

1

1500–1999

79 (37.4)

21 (29.5)

0.65

0.601

0.150

0.30 1.2

1000–1499

57 (27)

24 (33.8)

0.358

0.31

0.003*

0.142 0.67

Age

at admission

Within 1 h

98 (46.4)

39 (55)

1

1

1–6 h

76 (36)

20 (28.2)

1.37

0.68

0.156

0.40 1.15

6–24 h

9 (4.3)

2 (3)

0.89

2.38

0.090

0.87 6.5

after 24 h

28 (13.3)

10 (14)

1.05

0.48

0.186

0.16 1.41

Delivery - mode

SVD

104 (49)

42 (59)

1

1

Cesarean section

106 (50)

28 (39.4)

1.3

0.59

0.034*

0.36 0.96

Hypothermia

Yes

116 (55)

40 (56)

1

1

No

95 (45)

31 (44)

1.18

1.37

0.285

0.789 2.23

Respiratory distress

Yes

146 (69.2)

63 (88.7)

1

1

No

65 (30.8)

8 (11.3)

1.92

1.16

0.623

0.637 2.11

New diagnoses

During follow up.

Yes

135 (64)

63 (88.7)

1

1

No

76 (36)

8 (11.3)

3.91

1.78

0.063

0.933 3.15

HAI during follow up

Yes

31 (15)

30 (42)

1

1

No

180 (85)

41 (58)

3.52

2.25

0.017*

1.15 4.41

Antibiotics

Yes

177 (84)

70 (98.6)

1

1

No

34 (16)

1 (1.4)

4.35

2.92

0.009*

1.31 6.53

Respiratory support

Yes

156 (74)

68 (95.7)

1

1

No

55 (26)

3 (4.3)

4.08

4.49

0.236

0.37 54.13

TF initiation age

Within 24 h

53 (23.1)

3 (4.22)

7.12

6.05

0.000*

2.48 14.7

24-48 h

57 (27)

6 (8.45)

3.47

3.94

0.000*

1.84 8.45

48-72 h

43 (20.4)

6 (8.45

2.15

3.21

0.001*

1.591 6.51

After 72 h

27 (13)

9 (12.7)

1

1

Routine Pre-feed gastric residual evaluation

Yes

59 (32.7)

12 (50)

1

1

No

121 (67.3)

12 (50)

2

1.70

0.046*

1.1 2.87

Pacifier

Yes

12 (5.6)

1 (1.4)

1

1

No

199 (94.3)

70 (98.6)

0.582

0.564

0.376

0.159 2.00

Hospital

TASH

31 (14.7)

25 (35.2)

1

1

ZMH

30 (14.22)

11 (15.5)

1.14

2.43

0.142

0.742 7.98

GMH

50 (23.7)

7 (9.8)

1.32

2.55

0.083

0.886 7.3

M II RH

25 (11.8)

13 (18.3)

0.96

1.46

0.589

0.365 5.88

St. Peter hospital

32 (15.16)

5 (7.04)

1.4

1.7

0.351

0.557 5.18

SPHMMC

43 (20.38)

10 (14.1)

2.34

4.85

0.008

1.51 15.6