Table 3.

Placental abruption in first pregnancy and long-term mortality risk among women with singleton first births in Norway 1967–2002 and Sweden 1973–2003

Condition of first pregnancy	Number of women	Cardiovascular disease deaths		Non-cardiovascular disease deathsa		Total deaths
		Number	Adjusted hazard ratio (95 % confidence interval)b	Number	Adjusted hazard ratio (95 % confidence interval)b	Number	Adjusted hazard ratio (95 % confidence interval)b
Main analysis
Placental abruption
No	2,106,816	5398	1.0 (Referent)	40,572	1.0 (Referent)	49,583	1.0 (Referent)
Yes	10,981	55	1.8 (1.3, 2.4)	273	1.2 (1.0, 1.3)	361	1.3 (1.1, 1.4)
Sub-analyses
Excluding women with chronic hypertension, pre-pregnancy or gestational diabetes, preeclampsia
Placental abruption
No	2,012,488	4941	1.0 (Referent)	38,757	1.0 (Referent)	47,264	1.0 (Referent)
Yes	9775	45	1.7 (1.2, 2.3)	244	1.2 (1.0, 1.3)	317	1.3 (1.1, 1.4)
Norway only: excluding women with the above conditions plus pregnancy-related hypertension
Placental abruption
No	777,977	2212	1.0 (Referent)	17,868	1.0 (Referent)	21,290	1.0 (Referent)
Yes	4091	23	1.8 (1.2, 2.8)	117	1.2 (1.0, 1.4)	149	1.3 (1.1, 1.5)

^aExcluding all circulatory conditions

^bAdjusted for mother’s age at first birth, mother’s education, birth year of child, and in analyses of combined data, country