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Table 2 Birth, labor and delivery characteristics by fetal sex

From: Fetal sex impacts birth to placental weight ratio and umbilical cord oxygen values with implications for regulatory mechanisms

 

Males N = 35,749

Females N = 34,087

Birth weight (g)

3525 ± 521

3393 ± 490***

Placental weight (g)

685 ± 141

671 ± 138***

Birth weight categories

 SGA (%)

8.4

8.3

 AGA (%)

79.6

80.1

 LGA (%)

12.0

11.6

Anesthetic use

 

**

 Regional (%)

74.5

73.7

 General (%)

2.2

2.0

 None/Other (%)

23.3

24.3

Delivery type

 

**

 Vaginal (%)

81.1

82.8

 Labor CS (%)

12.8

10.5

 Elective CS (%)

6.2

6.7

NRFHR for CS (%)

3.2

2.3**

Umbilical artery pH

7.247 ± 0.063

7.249 ± 0.063**

Umbilical artery pH < 7.1 (%)

2.2

2.1

  1. Data presented as percentages and means ± SD; **p < 0.01, ***p < 0.001 vs respective Male value. SGA small for gestational age, AGA appropriate for gestational age, LGA large for gestational age, CS cesarean section, NRFHR non-reassuring FHR