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Table 2 Risk of pre/post term relative to full term by maternal country of birth: 1980 to 1996 (n = 385,180)

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 = 253,716)

AI

(n = 20,360)

FB-LIC

(n = 1265)

FB-LMIC

(n = 13,890)

FB-UMIC

(n = 12,469)

FB-HIC

(n = 83,480)

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)

1403

Ref

Ref

301

3.37 (2.97, 3.81)

3.20 (2.78, 3.68)

11

1.63 (0.90, 2.96)

1.59 (0.87, 2.89)

76

1.12 (0.89, 1.41)

1.04 (0.82, 1.31)

68

1.04 (0.82, 1.33)

0.98 (0.77, 1.25)

453

0.99 (0.89, 1.11)

0.96 (0.86, 1.07)

Very early preterm

(28–32 weeks)

1561

Ref

Ref

313

3.15 (2.78, 3.56)

2.67 (2.33, 3.06)

12

1.60 (0.90, 2.83)

1.63 (0.92, 2.89)

86

1.14 (0.92, 2.83)

1.11 (0.89, 1.38)

74

1.02 (0.81, 1.29)

1.01 (0.80, 1.27))

554

1.09 (0.89, 1.11)

1.09 (0.99, 1.20)

Early preterm

(32–33 weeks)

1891

Ref

Ref

323

2.68 (2.38, 3.02)

2.52 (2.21, 2.88)

9

0.99 (0.51, 1.91)

0.98 (0.51, 1.89)

104

1.14 (0.92, 1.42)

1.09 (0.89, 1.33)

98

1.12 (0.92, 1.37)

1.08 (0.88, 1.33)

677

1.10 (1.01, 1.20)

1.08 (0.99, 1.18)

Late preterm

(34–36 weeks)

11,263

Ref

Ref

2136

2.98 (2.83, 3.13)

2.80 (2.65, 2.95)

55

1.02 (0.77, 1.34)

1.00 (0.77, 1.33)

761

1.40 (1.30, 1.51)

1.35 (1.25, 1.46)

608

1.16 (1.07, 1.27)

1.13 (1.04, 1.23)

3970

1.09 (1.05, 1.13)

1.07 (1.03, 1.11)

Early term

(37–38 weeks)

58,132

Ref

Ref

5727

1.55 (1.50, 1.60)

1.61 (1.55, 1.67)

316

1.13 (0.99, 1.29)

1.08 (0.95, 1.23)

4196

1.50 (1.44, 1.55)

1.42 (1.37, 1.48)

3296

1.22 (1.17, 1.27)

1.16 (1.11, 1.21)

19,597

1.04 (1.02, 1.06)

1.01 (0.99, 1.03)

Full term

(39–41 weeks)

178,157

11,353

856

8594

8265

57,817

Post term

(42 > weeks)

1309

Ref

Ref

207

2.48 (2.14, 2.88)

1.58 (1.34, 1.85)

6

0.95 (0.43, 2.13)

1.11 (0.49, 2.47)

73

1.16 (0.91, 1.46)

1.29 (1.01, 1.64)

60

0.99 (0.76, 1.28)

1.12 (0.86, 1.45)

412

0.97 (0.87, 1.08)

1.05 (0.94, 1.17)

  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 age, and sex
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BMC Pregnancy and Childbirth

ISSN: 1471-2393

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