Table 3.

Multivariable logistic regression for factors associated with recurrent spontaneous miscarriage

Items	OR (95% CI)	P
Age	1.06 (1.03–1.10)	<0.001*
Education (Ref: Junior high school)	–	–
High school	0.61 (0.37–0.99)	0.047*
College or university	0.98 (0.67–1.44)	0.923
Master or above	0.27 (0.09–0.84)	0.023*
Uterine factor (Ref: No)	2.09 (1.18–3.68)	0.011*
Pelvic cavity factor (Ref: No)	0.46 (0.25–0.85)	0.014*
Endocrine disorder (Ref: No)	2.48 (1.02–6.05)	0.046*
Immune factor (Ref: No)	2.98 (1.48–6.02)	0.002*

*Statistical significance. –: Variable was not included in the final model; OR: Odds ratio; CI: Confidence interval; Ref: Reference group.