Table 2.

Risk of low birth weight associated with levels of manganese in maternal urine

Manganese (μg/g creatinine)	Cases	Controls	ORa (95 % CI)	ORb (95 % CI)
Total (n = 816)
< 0.30	55	204	1.11 (0.71, 1.74)	1.28 (0.67, 2.45)
0.30–1.16	48	204	1.00	1.00
≥ 1.16	101	204	2.19 (1.46, 3.27)	2.04 (1.12, 3.72)

Abbreviation: OR odds ratio; CI confidential interval

^a Unadjusted odds ratio

^b Adjusted for gestational age, household income, pre-pregnancy body mass index, parity, passive smoking, gestational hypertension