Table 1.

Maternal data.

	Type 1	%	Control	%	P value	Odds ratio	95% Cl
N	354		177471
Maternal age ≥ 35 years	59	16.7	21362	12.0	.008	1.46	[1.09–1.95]
Parity = 1	179	50.6	83711	47.1	.201	1.15	[0.93–1.42]
Parity > 1	175	49.4	93760	52.8	.201	0.87	[0.70–1.08]
Hypertension	69	19.5	8346	4.7	.000	4.91	[3.73–6.44]
IVF	7	2.0	3779	2.1	.843	0.93	[0.40–2.02]
Hormonal stimulation	11	3.1	3489	2.0	.122	1.60	[0.83–2.99]

IVF: in vitro fertlisation. CI: Confidence interval.