Table 2.

Trostad 2001. Odds ratio of recurrent pre-eclampsia with inter-pregnancy intervals of less than 1 or 5 years or more compared to 1–5 years. Results were adjusted by maternal age in 2nd pregnancy, new father, delivery year

Interval	OR	Low	High	Sub-group	OR	Low	High	Sub-group	OR	Low	High
≤1 year	1.24	0.83	1.85	Same father	1.18	0.76	1.85	New father	-	-	-
1–5 years	Ref.	Ref.	Ref.		Ref.	Ref.	Ref.		Ref.	Ref.	Ref.
6–10 years	1.04	0.93	1.16		1.06	0.93	1.21		1.02	0.65	1.61
11–15 years	0.85	0.61	1.19		0.52	0.27	1.01		0.63	0.29	1.4
>15 years	0.78	0.48	1.27		0.73	0.28	1.91		0.52	0.19	1.41