Table 3.

Risks of term (≥37 weeks) and preterm (<37 weeks) pre-eclampsia in a second pregnancy by change of partner between pregnancies

	Pre-eclampsia in second pregnancy
			OR (95% CI)
Pre-eclampsia in first pregnancy	Number	Rates (%)	Crude	Adjusted*	Fully adjusted†
Term
No
Same partner	3362	0.85	Reference	Reference	Reference
Different partner	340	1.15	1.36 (1.22 to 1.52)	0.86 (0.75–0.98)	0.97 (0.84–1.14)
Term
Same partner	1142	9.89	Reference	Reference	Reference
Different partner	67	9.19	0.92 (0.71–1.20)	0.98 (0.73–1.31)	1.03 (0.74–1.44)
Preterm
Same partner	275	14.20	Reference	Reference	Reference
Different partner	10	8.26	0.54 (0.28–1.05)	0.72 (0.36–1.47)	0.82 (0.37–1.80)
Preterm
No
Same partner	669	0.17	Reference	Reference	Reference
Different partner	113	0.38	2.27 (1.86–2.77)	0.97 (0.76–1.24)	1.21 (0.90–1.63)
Term
Same partner	149	1.29	Reference	Reference	Reference
Different partner	14	1.92	1.50 (0.86–2.61)	0.80 (0.42–1.53)	0.92 (0.43–1.96)
Preterm
Same partner	140	7.23	Reference	Reference	Reference
Different partner	6	4.96	0.67 (0.29–1.55)	0.42 (0.16–1.06)	0.24 (0.07–0.88)

*Adjusted for interpregnancy interval.

†Fully adjusted model. Adjustments were made for interpregnancy interval, maternal age, early pregnancy body mass index, height and smoking habits in second pregnancy, years of involuntary childlessness before second pregnancy, mother's country of birth and years of formal education, and the year of second birth.