TABLE 4.

Cut-off at 37 weeks. Crude results. Differences between early onset preeclampsia (EOP) and late onset preeclampsia (LOP): EOP: n = 1047 (60.3%); LOP, n = 689 (39.7%). Multiparae with preeclampsia: EOP, n = 578 (64.3%); LOP, n = 321 (35.7%)

Nonsignificant results Left numbers EOP n = 466 Right numbers LOP n = 1270			P value	Significant results EOP vs LOP OR [95% CI] Underlined: difference with cut-off at 34 weeks			P value
Adolescents (<18 y)	3.2% vs 3.8%	OR 0.89	.48	Mother age (y, SD)	29.3 vs 28.3		.002
Grand multiparae (5+)	10.4% vs 9.1%	OR 1.15	.38	Primigravidity	32.0% vs 39.9%	0.71 [0.58-0.87]	.001
BMI ≥25 kg/m2	53.4% vs 53.9%	OR 0.98	.46	Chronic hypertension	11.8% vs 7.8%	1.58 [1.13-2.2]	.007
Preexisting diabetes	4.2% vs 4.6%	OR 0.91	.69	Pre-pregnancy/booking BMI	26.6 vs 27.3 Kg/m2		.03
Coagulopathyb	0.8% vs 0.4%	OR 1.98	.29
Smoking	9.4% vs 8.3%	OR 1.14	.44
Antecedent	31.5% vs 29.7%	OR 1.09	.53
miscarriage
Antecedent abortion	25.4% vs 22.5%	OR 1.18	.26
Antecedent thyroid diseasea	2.4% vs 1.3%	OR 1.8	.11
Antecedent renal Disease	1.4% vs 0.7%	OR 1.8	.23
Allergy/asthma	7.3% vs 6.7%	OR 1.11	.32
35 y+	26.2% vs 22.2%	OR 1.24	.06
Medically induced	2.1% vs 1.0%	OR 2.1	.08
BMI ≥30 kg/m2	27.4% vs 31.5%	OR 0.82	.07
Differences from cut-off at 34 week’s gestation
Items becoming NON significant				Items becoming SIGNIFICANT
Antecedent	12.6% vs 9.9%	1.31	.16	Gestation (mean,	2.9 vs 2.6		.006
preeclampsia				SD)
Antecedent perinatal	11.8% vs 9.4%	0.77	.21	Parity (mean, SD	1.28 vs 1.10		.02
deaths
Gestational diabetes	15.5% vs 13.9%	1.13	.38	Primiparity	44.8% vs	OR 0.71	.001
					53.4%
Single mother	35.3% vs 40.1%	OR 0.82	.04
Years of schooling ≥10	53.5% vs 58.34%	OR 0.82	.05

^aThyroid diseases: goiter, hypo/hyperthyroidy, thyroidectomy, thyroid node, thyroiditis.

^b“Coagulopathies”: antiphospholipid syndrome, protein C/protein S deficit, factor 5, Leyden or other coagulation factors.