TABLE 1.

Baseline data for 3876 mothers with a live foetus at admission to hospital in the EXPRESS (Sweden, 2004–06), EPICure‐2 (England, 2006) and EPIPAGE‐2 (France, 2011) cohorts

Variable Levels	EXPRESS		EPICure‐2		EPIPAGE‐2		p‐value
	n	%	n	%	n	%
Maternal age (years)
<25	108	15.8	575	28.3	274	23.8	<0.001
25–34	384	56.3	1028	50.6	668	58.1
≥35	190	27.9	429	21.1	208	18.1
Missing	5	–	4	–	3	–
Parity
Nullipara	270	39.3	979	48.6	481	42.1	<0.001
Para 1+	417	60.7	1034	51.4	661	57.9
Missing	0	–	23	–	11	–
Pre‐existing diabetes
No	644	98.8	2010	98.8	1118	99.1	0.709
Yes	8	1.2	24	1.2	10	0.9
Missing	35	–	2	–	25	–
Pre‐existing hypertension
No	662	96.4	1978	97.2	1117	96.9	0.579
Yes	25	3.6	58	2.8	36	3.1
PIH/PE
No	613	89.2	1906	93.6	1071	92.9	<0.001
Yes	74	10.8	130	6.4	82	7.1
Onset of labour
Spontaneous	518	76.5	1709	84.4	872	77.4	<0.001
Induced	12	1.8	83	4.1	43	3.8
None	147	21.7	234	11.5	211	18.7
Missing	10	–	10	–	27	–

Percentages may not equal 100 due to rounding.

Abbreviations: PE: pre‐eclampsia; PIH: pregnancy‐induced hypertension.