Clinical risk factors for preterm birth and evaluating maternal psychology in the postpartum period

Table 5 Analysis of risk factors for preterm birth

Factors	β	Standard error	χ2	P value	OR	95%CI
						Lower bound	Upper bound
Age	0.650	0.428	2.315	0.128	1.916	0.829	4.429
Maternal weight change	-1.453	0.396	13.456	< 0.001c	0.234	0.108	0.508
Mode of conception	0.967	0.674	2.057	0.151	2.630	0.702	9.855
Gestational diabetes mellitus	1.577	0.586	7.244	0.007b	4.839	1.535	15.254
Reproductive tract infection	0.811	0.500	2.629	0.105	2.250	0.844	5.997
Cervical length in the second trimester	-3.784	0.521	52.804	< 0.001c	0.023	0.008	0.063
White blood cell count	2.255	0.512	19.420	< 0.001c	9.537	3.498	26.004
Maternal anxiety and depression	1.802	0.391	21.301	< 0.001c	6.064	2.821	13.036

^bP < 0.01.

^cP < 0.001.

OR: Odds ratio; CI: Confidence interval.