Table 6 Bivariable and multivariable Weibull regression analysis for predictors of mortality among low birth weight neonates in their first week of life admitted to NICU of Northwestern Ethiopia Comprehensive Specialized Hospitals from March 21, 2020 to March 1, 2022. (n = 761)

Sex

 Male

 Female

277

237

0.83(0.65-1.065)

1

1.03(0.783–1.35)

1

Maternal age

 ≤20

 ≥35

 21–34

66

91

357

1.2(0.86-1.72)

0.67(0.45 − 1.00)

1

1.41(0.95–2.08)

0.67(0.44–1.02)

1

Mode of delivery

 Instrumental

 CS

 SVD

24

107

383

0.41(0.17–0.99) 0.99(0.75–1.34)

1

0 0.70(0.28–1.77)

1.01(0.71–1.44)

1

Type of pregnancy

 Multiple

 Single

114

400

1.36(1.04–1.78)

1

1.15(0.86–1.55)

1

Corticosteroid

treatment

 No

 Yes

400

114

0.83(0.63–1.09)

1

1.07(0.79–1.46)

1

Preeclampsia

 Yes

 No

98

416

2.23(1.73–2.87)

1

1.77(1.32–2.36) ***

1

APH

 Yes

 No

42

472

1.40 (0.95–2.06)

1

1.38 (0.92–2.08)

1

Gravidity

 ≤1

 >1

117

407

0.79(0.57–1.11)

1

0.82(0.57–1.20)

1

HIV/AIDS

 Yes

 No

18

496

1.72(1.10–2.69)

1

1.53(0.95–2.46)

1

1st minute APGAR

 <7

149

1.92 (1.49–2.46)

1.32(0.98-1.79)

 ≥7

365

1

1

5th minute APGAR

 <7

 ≥7

24

490

2.56(1.87–3.53)

1

1.40(0.95–2.08)

1

Birth weight

 ≤999

 1000–1499

 1500–2499

10

61

443

4.72(3.02–7.34)

3.22(2.47–3.4.20)

1

3.13(1.91–5.12) **

1.99(1.47–2.68)***

1

Gestational age

 <37

 ≥37

304

210

2.6(1.85–3.66)

1

1.86(1.30–2.67)**

1

PNA

 Yes

 No

40

474

2.15(1.56–2.95)

1

1.64(1.14–2.36) **

1

RDS

 Yes

 No

189

325

2.6(1.99- 3.40

1

1.76(1.31–2.34)***

1

Jaundice

 Yes

 No

82

432

0.59(0.38-0.92)

1

0.81(0.50–1.29)

1

NEC

 Yes

 No

20

494

2.34(1.56–3.51)

1

2.78(1.79–4.32)***

1

Hypothermia

 Yes

 No

168

346

1.21(0.94–1.57)

1

1.05(0.80–1.38)

1

IUGR

`

 Yes

 No

22

492

1.52 (0.95–2.43)

1

1.58(0.95–2.61)

1