Table 4.

Adjusted^a multivariable log binomial and Poisson regression models: twin birth preeclampsia relative risk

	All cycles N=8,378		Fresh Autologous N=6,650		Cryopreserved Autologous N=753		Fresh Donor N=841		Cryopreserved Donor N=134
	aRR (CI)	p value	aRR (CI)	p value	aRR (CI)	p value	aRR (CI)	p value	aRR (CI)	p value
# embryos transferred (continuous)	1.09 (1.001, 1.19)	0.040	1.07 (0.98, 1.17)	0.137	1.03 (0.84, 1.28)	0.722	0.58 (0.24, 1.41)	0.232	1.49 (0.69, 3.19)	0.300
# prior ART cycles (continuous)	0.98 (0.95, 1.02)	0.406	0.99 (0.96, 1.02)	0.701	1.13 (0.99, 1.28)	0.062	0.97 (0.89, 1.06)	0.548	1.01 (0.89, 1.16)	0.854
Vanishing triplet (yes vs. no)	0.93 (0.69, 1.26)	0.639	0.93 (0.78, 1.11)	0.453	0.86 (0.32, 2.31)	0.766	1.53 (0.42, 5.52)	0.519	0.28 (0.01, 7.76)	0.451

^acontrolling for cycle type (all cycles model only), gravida, infant sex, mother's age, non-White race, diabetes and hypertension

Referent values:

Total embryos: Continuous

Prior ART: Continuous

Vanishing twin: No

Cycle type: Fresh non-donor

Gravida: Continuous

Infant sex: Male

Mother's age: Continuous

Non-White race: White

Diabetes: No

Hypertension: No