Variable	Bivariate analysis			Multivariate analysis
	OR	95% CI	P	OR	95% CI	P
Age>30 years	0.41	0.175-0.982	0.04	0.54	0.20-1.45	0.22
Primiparous	3.08	1.45-6.56	0.00	2.34	0.99-5.52	0.05
Previous nephritis	2.06	0.973-4.385	0.05
Hypocomplementemia	9.97	1.16-7.58	0.01	2.54	0.94-6.84	0.06