Table 4.

Forward logistic regression model for the occurrence of PTB.

variables	OR	p-value	95% CI
			lower	upper
anxiety	2.16	<0.001	1.28	3.64
occasional meat consumption	4.33	<0.001	2.60	7.22
Presence of and caring for domestic animal	5.06	<0.001	2.44	10.58
manual work	1.70	<0.05	1.02	2.84
urinary tract infection	2.85	<0.001	1.63	4.98
direct trauma to the abdomen	3.76	<0.001	1.77	7.98
abortion	6.36	<0.001	2.77	14.63
cervical incompetence	4.74	<0.001	2.29	9.79
multiple gestation	7.51	<0.01	1.89	29.87