Table 3.

Univariate and multivariate logistic regression for the factors associated with preeclampsia

Variable	Cases	Controls	p-value	cOR (95% C.I.)	p-value	aOR (95% C.I.)
Parity
Nulliparous	22	17	0.28	1.62 (0.68–3.84)	0.95	1.04 (0.33–3.27)
Multiparous	20	25	Ref
Gestational age (weeks)
< 28	1	1	0.76	1.55 (0.09–26.01)	0.10	13.60 (0.63–294.62)
28–34.9	9	3	0.03	4.64 (1.13–19.04)	0.13	3.69 (0.70–19.65)
35–36.9	10	4	0.04	3.86 (1.08–13.86)	0.12	3.52 (0.72–17.30)
≥ 37	22	34	Ref
Ionized Calcium level (mmol/l)
< 1.16	29	9	0.00	8.1 (3.05–21.91)	0.00	7.51 (2.39–23.60)
≥ 1.16	13	33	Ref
Total serum calcium level (mmol/l)
< 2.1	29	15	0.00	4.02 (1.62–9.97)	0.045	3.10 (1.02–9.37)
≥ 2.1	13	27	Ref
Dietary calcium intake (gm/24 h)
< 1000	27	18	0.05	2.40 (1.00–5.78)	0.03	3.42 (1.10–10.72)
≥ 1000	15	24	Ref

cOR Crude odds ratio, aOR Adjusted odds ratio, 95% C.I. 95% confidence interval