Table 4.

Associations between vitamin D deficiency and birth asphyxia^a

	OR	95% CI	P
Vitamin D status
25OHD ≥ 30 nmol/L (ref)
25OHD < 30 nmol/L	2.223	1.023–4.830	0.044
Obesity
No (ref)
Yes	1.758	0.861–3.590	0.122
Nulliparity
No (ref)
Yes	1.637	0.908–2.952	0.101
Season at sampling
May- Oct (ref)
Nov-Apr	0.532	0.310–0.914	0.022
Epidural anaesthesia at delivery
No (ref)
Yes	1.887	1.059–3.362	0.031
Maternal age (years)	1.034	0.978–1.094	0.242
Maternal height (cm)	0.964	0.925–1.004	0.080

CI confidence interval, OR odds ratio, BMI body mass index, T3 third trimester, 25OHD 25-hydroxyvitamin D

^aDefined as either arterial umbilical cord pH < 7.1 or 5 min Apgar score < 7