Association of gestational anemia with pregnancy conditions and outcomes: A nested case-control study

Table 3 Results of multivariable logistic regression analysis

Characteristics	P value	OR	95%CI of OR
			Lower limit	Upper limit
East region	< 0.001
Middle region	< 0.001	0.428	0.331	0.553
West region	< 0.001	0.406	0.309	0.533
North region	< 0.001	7.169	5.139	10.003
< 20 yr	0.07
20-25 yr	0.077	2.635	0.900	7.711
25-30 yr	0.245	1.856	0.654	5.269
30-35 yr	0.367	1.623	0.567	4.646
35-40 yr	0.399	1.596	0.538	4.738
> 40 yr	0.961	0.968	0.259	3.617
Full-term birth	0.002	0.491	0.316	0.763
PROM	0.022	1.404	1.051	1.876

CI: Confidence interval; OR: Odds ratio; PROM: Premature rupture of membranes.