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

Table 2 Results of univariable logistic regression analysis

Characteristics	P value	OR	95%CI of OR
			Lower	Upper
East region	< 0.01
Middle region	< 0.01	0.6	0.47	0.76
West region	< 0.01	0.66	0.51	0.85
North region	< 0.01	5.95	4.33	8.18
< 20 yr	0.01
20-25 yr	< 0.01	5.93	2.1	16.74
25-30 yr	0.01	4.12	1.5	11.32
30-35 yr	0.01	3.96	1.43	10.94
35-40 yr	0.01	4.48	1.57	12.78
> 40 yr	0.09	3.03	0.85	10.77
Preterm	0.03
Full-term birth	0.01	0.59	0.39	0.88
Rural registration	< 0.01	1.58	1.28	1.95
PROM	< 0.01	1.61	1.23	2.11
BMI classification	0.41
Gestational weight gain classification	0.57
Primary school or lower	< 0.01
Junior middle school	0.98	1.01	0.33	3.12
High school	0.46	0.65	0.21	2.01
College	0.21	0.49	0.16	1.49
Master’s degree	0.31	0.54	0.17	1.76
Doctoral degree	0.42	1.87	0.4	8.74
Unemployed	0.02
Administration	0.2	0.79	0.54	1.14
Professionals	0.1	0.77	0.56	1.05
Office clerk	0.07	0.7	0.48	1.03
Business services industry	0.06	0.75	0.56	1.01
Agricultural industry	0.03	1.88	1.05	3.36
Others	0.09	0.75	0.54	1.04
Personal annual income	< 0.01
Family annual income	< 0.01

BMI: Body mass index; CI: Confidence interval; OR: Odds ratio; PROM: Premature rupture of membranes.