Table 4.

Multivariate logistic regression analysis

Factors	Bate	SE	Wald	OR	95% CI	P
Multiple pregnancy	1.224	0.429	7.425	3.521	1.415-8.926	0.006
Abnormal fetal position	0.536	0.128	6.633	1.538	1.124-2.331	0.008
Gestational diabetes	2.218	0.617	45.812	9.816	4.918-19.164	0.002
Mode of conception	0.954	0.258	15.852	2.856	1.765-4.285	0.002
Lower genital tract infection	0.666	0.266	4.966	1.755	1.076-2.867	0.032
Second trimester cervical length	0.451	0.251	4.581	1.741	1.071-2.991	0.031