Retrospective study of factors related to preterm labor in Yasuj, Iran

Figures & data

Table 1 Comparison between variables in preterm and full term labor using univariate analysis

Variable	χ^2	df	P-value	Sig
Mothers’ age	1.29	1	0.21	NS
Education	3.82	2	0.14	NS
Job	6.24	1	0.1	NS
Height	1.29	1	0.21	NS
Weight	2.19	1	0.17	NS
Place of residence	65.3	2	0.16	NS
Income	6.79	1	0.09	NS
Nutrition status	2.19	1	0.17	NS
BMI	5.41	2	0.06	NS
Number of deliveries	5.98	2	0.06	NS
Number of pregnancies	9.91	1	0.001	S
History of abortion	2.19	1	0.17	NS
Stillbirth history	2.29	1	0.13	NS
Twin or multiplex pregnancy	2.43	1	0.11	NS
Smoking	1.09	1	0.32	NS
Alcohol usage	0.79	1	0.49	NS
Pregnancy excess weight	6.79	1	0.09	NS
General health status	18.6	2	0.002	S
History of preterm labor	2.29	1	0.13	NS
Exposure to radiation	2.19	1	0.17	NS
History of diabetes mellitus/ thyroid dysfunction/cardiac disease of mothers	9.64	3	0.004	S

Abbreviations: df, degrees of freedom; Sig, significance; NS, not significant; S, significant; BMI, body mass index.

Table 2 Results of multivariate analysis using logistic regression model

Variable	Beta coeff	Wald statistic	P-value	OR	95% CI for OR
Number of pregnancies	−1.40	12.86	0.000	0.18	0.07–0.46
Mothers’ general health	−1.06	7.36	0.007	0.35	0.16–0.75
History of diabetes mellitus/thyroid dysfunction/cardiac disease of mothers	−0.82	8.99	0.003	0.44	0.26–0.75

Note: The level of determining coefficient for the above model was estimated to be 60%.

Abbreviations: coeff, coefficient; OR, odds ratio; CI, confidence interval.