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Table 1 Perinatal and clinical characteristics of infants who died

From: Causes of death in very preterm infants cared for in neonatal intensive care units: a population-based retrospective cohort study

Variable

Survived

Died

Univariate analysis

P

Multivariate analysis

n = 4109

n = 345

OR (95% CI)

Adjusted OR (95% CI)

Maternal age(mean ± SD)

30 ± 6

30 ± 6

---

0.978

---

Maternal indigenous status

229 (6%)

22 (6%)

1.15 (0.73–1.81)

0.301

---

Attended antenatal care

4021 (98%)

330 (96%)

0.48 (0.27–0.84)

0.009

0.83 (0.39–1.77)

Assisted conception

512 (13%)

41 (12%)

0.94 (0.67–1.33)

0.761

---

Multiple Births

1210 (29%)

82 (24%)

0.75 (0.58–0.97)

0.026

1.03 (0.72–1.47)

Hypertensive Disease of Pregnancy

802 (20%)

46 (13%)

0.63 (0.46–0.87)

0.005

0.93 (0.59–1.45)

Antepartum Haemorrhage

985 (24%)

123 (36%)

1.76 (1.39–2.21)

0.000

1.23 (0.90–1.68)

Chorioamnionitis

838 (20%)

94 (27%)

1.46 (1.14–1.87)

0.003

0.89 (0.76–1.04)

Antenatal Steroids

3724 (91%)

288 (84%)

0.52 (0.38–0.71)

0.000

0.84 (0.53–1.32)

Out born

452 (11%)

52 (15%)

1.44 (1.05–1.96)

0.022

0.98 (0.62–1.56)

Vaginal Breech Delivery

210 (5%)

62 (18%)

4.07 (2.99–5.54)

0.000

1.33 (0.87–2.04)

Gestation, weeks

29 ± 2

26 ± 2

---

0.000

---

Gestation

 22–25 weeks

344

178

---

0.000

16.34 (10.23–25.97)

 4026–28 weeks

1248

118

  

3.46 (2.24–5.35)

 4029–31 weeks

2517

49

  

1.00 (referent)

Male gender

2134 (52%)

223 (65%)

1.69 (1.34–2.13)

0.000

1.47 (1.10–1.96)

Birth weight, g

1285 ± 377

895 ± 362

---

0.000

---

Small for Gestational Age

286 (7%)

37 (11%)

1.61 (1.12–2.31)

0.009

2.14 (1.28–3.56)

APGAR <7 at 5 mins

697 (17%)

186 (56%)

5.73 (4.56–7.18)

0.000

2.41 (1.79–3.23)

Early Onset Sepsis

66 (2%)

28 (8%)

5.41 (3.43–8.54)

0.000

4.21 (2.34–7.56)

Late Onset Sepsis

742 (18%)

75 (22%)

1.26 (0.96–1.65)

0.054

---

Surfactant treated HMD

2371 (58%)

294 (85%)

4.23 (3.12–5.73)

0.000

0.84 (0.55–1.27)

PPHN

143 (3%)

62 (18%)

6.08 (4.41–8.38)

0.000

3.06 (2.02–4.64)

Pulmonary haemorrhage

69 (2%)

58 (17%)

11.8 (8.18–17.1)

0.000

4.26 (2.65–6.87)

IVH Grade III/IV

96 (2%)

112 (32%)

20.1 (14.8–27.2)

0.000

9.27 (6.30–13.64)

HIE Stage 2

8 (0.2%)

24 (7%)

38.3 (17.0–86.0)

0.000

4.52 (3.18–6.43)

NEC Stage 2

92 (2%)

40 (12%)

5.73 (3.88–8.45)

0.000

2.02 (1.59–2.57)

  1. The number of infants n (%), mean ± SD and median (quartiles) are shown. Significant variables defined by univariate analysis are entered into a multivariate analysis. Odds ratio and adjusted odds ratios are shown