Table 3.

Logistic regression analysis: B-Pb <5 (reference) or ≥5 μg/dl as a predictor of preterm delivery and of low birthweight

	OR	95% CI	P value
Preterm (yes)
Univariate	1.72	1.25–2.38	0.001
Multivariate*	2.00	1.35–3.00	0.001
LBW (yes)
Univariate	1.31	1.00–1.71	0.049
Multivariate**	1.37	0.86–2.18	0.187

Preterm, <37 weeks of gestation; low birthweight (LBW), <2500 g.

^*Adjusted for maternal height, maternal prepregnancy weight, maternal educational attainment, parity, no. of cigarettes per day, sex of baby.

^**Adjusted for maternal height, maternal prepregnancy weight, maternal educational attainment, parity, no. of cigarettes per day, sex of baby and gestational age at delivery or death.

[Correction added on 12 December 2014 after first online publication: The pre-term univariate and multivariate values were miscalculated and have been corrected in Table 3 and results section.]