Maternal oxygen exposure may not change umbilical cord venous partial pressure of oxygen: non-random, paired venous and arterial samples from a randomised controlled trial

Table 1 Baseline characteristics

Outcome	Oxygen Group (n = 107)	Placebo Group (n = 110)	P
Age (y)	30 (27–32)	29 (28–31)	0.62
Gestational age (wk)	40.0 (39.3–40.9)	40.0 (39.3–40.4)	0.22
Admission BMI (kg/m²)	25.8 (24.5–27.6)	26.6 (24.5–28.6)	0.16
Antepartum hemoglobin (g/L)	127.1 [9.1]	127.2 [9.8]	0.93
Duration of first stage (min)	450 (310–590)	450 (300–660)	0.76
Duration of second stage (min)	47 (31–67)	42 (28–58)	0.29
Maternal pH	7.367 (7.337–7.391)	7.359 (7.332–7.381)	0.16
Maternal PO₂ (mmHg)	150.0 (142.6–156.7)	112.0 (104.8–118.3)	< 0.001
Maternal PCO₂ (mmHg)	26.1 [4.1]	27.2 [3.4]	0.03

Data are expressed as median (25th–75th percentile) or mean [standard deviation]
BMI body mass index
Data from reference 11

ISSN: 1471-2393