Skip to main content

Table 3 Risk of pre/post term relative to full term by maternal country of birth: 1997–2010 (n = 345,837)

From: Are preterm birth and intra-uterine growth restriction more common in Western Australian children of immigrant backgrounds? A population based data linkage study

Gestational age

ANI

(n = 231,950)

AI

(n = 20,206)

FB-LIC

(n = 2840)

FB-LMIC

(n = 17,951)

FB-UMIC

(n = 17,452)

FB-HIC

(n = 55,438)

n

cRRR, (95%CI)

aRRRa (95%CI)

n

cRRR, (95%CI)

aRRRa (95%CI)

n

cRRR, (95%CI)

aRRRa (95%CI)

n

cRRR, (95%CI)

aRRRa (95%CI)

n

cRRR, (95%CI)

aRRRa (95%CI)

n

cRRR, (95%CI)

aRRRa (95%CI)

Extreme preterm

(< 28 weeks)

1457

Ref

Ref

370

3.27 (2.91, 3.67)

2.75 (2.41, 3.14)

30

1.46 (1.02, 2.11)

1.42 (0.98, 2.04)

137

1.29 (1.08, 1.54)

1.32 (1.10, 1.57)

106

1.00 (0.82, 1.22)

1.02 (0.83, 1.24)

349

0.99 (0.88, 1.12)

0.96 (0.85, 1.08)

Very early preterm

(28–32 weeks)

1269

Ref

Ref

321

3.26 (2.88, 3.69)

2.73 (2.37, 3.14)

25

1.40 (0.94, 2.08)

1.37 (0.92, 2.04)

121

1.31 (1.08, 1.58))

1.34 (1.11, 1.62)

97

1.05 (0.85, 1.29)

1.08 (0.87, 1.33)

313

1.02 (0.90, 1.16)

0.99 (0.88, 1.13)

Early preterm

(32–33 weeks)

1570

Ref

Ref

347

2.85 (2.53, 3.20)

2.59 (2.27, 2.96)

16

0.72 (0.44, 1.19)

0.71 (0.43, 1.17)

130

1.14 (0.95, 1.36)

1.16 (0.97, 1.39)

103

0.90 (0.74, 1.10)

0.91 (0.74, 1.11)

402

1.06 (0.95, 1.19)

1.02 (0.91, 1.14)

Late preterm

(34–36 weeks)

11,822

Ref

Ref

1900

2.07 (1.96, 2.18)

1.91 (1.81, 2.03)

100

0.60 (0.49, 0.74)

0.60 (0.50, 0.74)

958

1.11 (1.04, 1.19)

1.14 (1.07, 1.23)

865

1.00 (0.94, 1.08)

1.01 (0.94, 1.09)

2659

0.93 (0.89, 0.97)

0.89 (0.85, 0.93)

Early term

(37–38 weeks)

73,135

Ref

Ref

6173

1.09 (1.05, 1.12)

1.20 (1.17, 1.25)

656

0.64 (0.58, 0.70)

0.62 (0.57, 0.68)

6196

1.16 (1.12, 1.20)

1.15 (1.11, 1.19)

5903

1.11 (1.07, 1.15)

1.06 (1.02, 1.09)

17,311

0.98 (0.96, 1.00)

0.90 (0.88, 0.92)

Full term

(39–41 weeks)

142,379

11,054

2004

10,386

10,360

34,345

Post term

(42 > weeks)

318

Ref

Ref

41

1.67 (1.20, 2.30)

1.73 (1.20, 2.48)

9

2.01 (1.03, 3.90)

1.93 (0.99, 3.78)

23

0.99 (0.65, 1.51)

0.98 (0.64, 1.50)

18

0.78 (0.48, 1.25)

0.76 (0.47, 1.22)

59

0.77 (0.58, 1.01)

0.73 (0.55, 0.97)

  1. ANI Australian-born mothers of non-Indigenous backgrounds, AI Australian-born mothers of Indigenous background, FB-LIC foreign-born mothers from low-income countries, FB-LMIC foreign-born mothers from lower-middle-income countries, FB-UMIC foreign-born mothers of upper-middle-income countries, FB-HIC foreign-born mothers from high-income countries, cRRR crude relative risk ratio, aRRR adjusted relative risk ratio, CI confidence interval, Ref reference group
  2. a Adjusted for parity, birth year, SEIFA score, maternal smoking status, maternal age, and sex
Back to article page

BMC Pregnancy and Childbirth

ISSN: 1471-2393

Contact us