Table 5. Result of logistic regression (odds ratio, 95% confidence interval and p-value) of factors associated with low birthweight.

Sections	Variables	OR	95%CI	p
Section 1	Water consumed during pregnancy
	Mineral, from mines, wells, cisterns or the supply service of non-affected municipalities	Ref	-
	Supply services of affected municipalities	2.444	1.203–4.965	0.013*
Section 2	Previous child with low birthweight
	Previous child with adequate weight	Ref	-	0.052
	Previous child with low weight	3.729	0.860–16.167	0.079
	First child	2.033	1.047–3.948	0.036*
Section 3	Smoking habit
	No	Ref	-
	Yes	2.850	1.013–8.021	0.047*

RC: odds ratio; 95%CI: 95% confidence interval; p-value: level of statistical significance; Ref: reference category

* p < 0.05.