TABLE 3.

Cut-off at 32 weeks. Crude results. Differences between early onset preeclampsia (EOP) and late onset preeclampsia (LOP): EOP, n = 466 (26.8%); LOP: n = 1270 (73.2%). Multiparae with preeclampsia: EOP, n = 255 (28.4%); LOP, ∣n = 644 (71.6%)

Nonsignificant results Left numbers EOP, n = 466 Right numbers LOP, n = 1270			P value	Significant results EOP vs LOP ODDS ratios [95% CI] Underlined: difference with cut-off 34 weeks			P value
Gestation (mean,SD)	2.9 vs 2.75		.18	Mother’s age (y,SD)	29.7 vs 28.6		.002
Parity (mean, SD	1.30 vs 1.17		.14	Chronic hypertension	12.9% vs 9.3%	1.44 [1.04-2.0]	.02
Primiparity	45.3% vs 49.3%	OR 0.85	.14	Gestational diabetes	12.1% vs 15.9%	0.73 [0.53-1.01]	.06
Adolescents (<18 y)	2.6% vs 3.7%	OR 0.69	.25	Antecedent perinatal deaths	13.9% vs 9.7%	1.49 [1.0-2.2]	.05
Grand multiparae (5+)	11.2% vs 9.5%	OR 1.2	.29	Antecedent preeclampsia	14.5% vs 7.5%	2.07 [1.4-3.0]	.0001
Single mother	36.1% vs 37.7%	OR 0.93	.53
Years of schooling ≥10	55.3% vs 55.4%	OR 1.0	.97
BMI ≥25 kg/m2	55.2% vs 53.1%	OR 1.09	.47
BMI ≥30 kg/m2	28.6% vs 29.3%	OR 0.97	.79
Preexisting diabetes	4.3% vs 4.4%	OR 0.99	.96
Smoking	9.9% vs 8.6%	OR 1.12	.40
Antecedent miscarriage	312% vs 30.7%	OR 1.03	.85
Antecedent abortion	27.4% vs 23.1%	OR 1.26	.12
Antecedent thyroid diseasea	1.5% vs 1.3%	OR 1.12	.79
Antecedent renal disease	1.7% vs 0.9%	OR 1.99	.20
Medically induced	2.1% vs 1.5%	OR 1.4	.34
Allergy/asthma	7.1% vs 7.1%	OR 0.99	.49
Differences from cut-off at 34 weeks’ gestation
Items becoming NON significant				Items becoming SIGNIFICANT
Primigravidity	32.0% vs 36.3%	OR 0.82	.09	Coagulopathyb	1.3% vs 0.5%	OR 2.7	.07
Pre-pregnancy/booking BMI	26.7 vs 26.9 kg/M2		.60	35 y+	27.5% vs 23.5%	OR 1.23	.09

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

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