Early-life cadmium exposure and child development in 5-year-old girls and boys: a cohort study in rural Bangladesh.

Abstract:

BACKGROUND:Cadmium is a commonly occurring toxic food contaminant, but health consequences of early-life exposure are poorly understood. OBJECTIVES:We evaluated the associations between cadmium exposure and neurobehavioral development in preschool children. METHODS:In our population-based mother-child cohort study in rural Bangladesh, we assessed cadmium exposure in 1,305 women in early pregnancy and their children at 5 years of age by measuring concentrations in urine (U-Cd), using inductively coupled plasma mass spectrometry. Children's IQ at 5 years of age, including Verbal (VIQ), Performance (PIQ), and Full-Scale IQ (FSIQ), were measured by Wechsler Preschool and Primary Scale of Intelligence. Behavior was assessed by the Strengths and Difficulties Questionnaire (SDQ). RESULTS:In multiple linear regression models, adjusted for sex, home stimulation, socioeconomic status (SES), and maternal and child characteristics, a doubling of maternal U-Cd was inversely associated with VIQ (-0.84 points; 95% confidence interval: -1.3, -0.40), PIQ (-0.64 points; -1.1, -0.18), and FSIQ (-0.80 points; -1.2, -0.39). Concurrent child U-Cd showed somewhat weaker association with VIQ and FSIQ, but not PIQ. Stratification by sex and SES indicated slightly stronger associations with PIQ and FSIQ in girls than in boys and in higher-income compared with lower-income families. Concurrent U-Cd was inversely associated with SDQ-prosocial behavior and positively associated with SDQ-difficult behavior, but associations were close to the null after adjustment. Quantile regression analysis showed similar associations across the whole range of each developmental outcome. CONCLUSION:Early-life low-level cadmium exposure was associated with lower child intelligence scores in our study cohort. Further research in this area is warranted.

authors

Kippler M,Tofail F,Hamadani JD,Gardner RM,Grantham-McGregor SM,Bottai M,Vahter M

doi

10.1289/ehp.1104431

subject

Has Abstract

pub_date

2012-10-01 00:00:00

pages

1462-8

issue

10

eissn

0091-6765

issn

1552-9924

journal_volume

120

pub_type

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