Table 2 Comparison of obstetric outcomes between sensitized children and general population

Sex (Male)

171

59.8%

34,327

51.6%

0.005*

Season of birth

0.806*

Spring

66

23.1%

16,241

24.4%

Summer

66

23.1%

16,086

24.2%

Autumn

73

25.5%

17,005

25.5%

Winter

81

28.3%

17,251

25.9%

Preterm (Yes)

19

6.6%

7701

11.6%

0.009*

Breastfed (Yes)

208

83.2%

38,431

77.5%

0.030*

Birth weight (kg)

3.395

± 0.591

3.305

± 0.685

0.011**

Birth length (cm)

50.5

± 3.4

50.3

± 3.9

0.279**

Birth HC (cm)

34.5

± 2.1

34.3

± 2.3

0.053**

z-score birth weight

0.062

± 1.014

0.007

± 1.072

0.387**

z-score birth length

0.154

± 1.109

0.134

± 1.184

0.780**

z-score birth HC

0.022

± 0.974

0.007

± 1.075

0.798**

Pregnancy related factors

 Conception (assisted)

20

8.3%

1960

4.0%

0.001*

 TPL (yes)

9

3.6%

2403

4.8%

0.639*

 Medical problem during pregnancy (yes)

11

4.4%

1934

3.8%

0.671*

 Resuscitation intervention (yes)

84

33.5%

15,752

31.3%

0.463*

 Delivery techniques used (yes)

14

5.6%

2206

4.4%

0.358*

 Mode of birth (CS)

94

37.5%

17,188

34.2%

0.274*

 Multiple birth (yes)

10

3.5%

2610

3.9%

0.713*

Maternal factors

 Gravidity

1

(0–2)

2

(1–3)

< 0.001***

 Parity

1

(0–1)

1

(0–2)

0.001***

 BMI (kg/m²)

0.017*

  Underweight (< 18.5)

33

13.6%

5234

10.7%

  Normal (18.5–24.9)

120

49.4%

20,119

41.0%

  Overweight (25–29.9)

49

20.2%

11,531

23.5%

  Obesity class I (30–34.9)

24

9.9%

6676

13.6%

  Obesity class II (35–39.9)

9

3.7%

3193

6.5%

  Obesity class III (≥ 40)

8

3.3%

2353

4.8%

 Age at delivery (years)

0.001*

  < 20

13

4.5%

4382

6.6%

  20–35

211

73.8%

52,801

79.3%

  > 35

62

21.7%

9399

14.1%

 Diabetes (Yes)

19

6.6%

3988

6.0%

0.642*

 Smoking (Yes)

24

9.9%

10,348

21.2%

< 0.001*

 Alcohol consumption (Yes)

1

0.4%

877

1.8%

0.139****

 Illegal drug use (Yes)

3

1.2%

1133

2.3%

0.387****

 Born in Australia (Yes)

201

70.3%

50,849

76.4%

0.015*