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Neurobehavioural consequences of prenatal low level exposures to lead
G H Cooney1, A Bell, W McBride
1Macquarie University, Sydney, Australia.
Insights
This study found no link between low fetal lead exposure and developmental issues in children up to three years old. Neurobehavioral development was assessed in children exposed to maternal and cord blood lead levels within a specific range.
Area of Science:
- Environmental Health
- Developmental Pediatrics
- Toxicology
Background:
- Prenatal and early childhood lead exposure is a public health concern.
- Understanding the impact of low-level lead exposure on neurodevelopment is crucial.
- Previous research has indicated potential adverse effects, necessitating further investigation.
Purpose of the Study:
- To investigate the relationship between maternal and cord blood lead levels and child neurobehavioral development.
- To assess developmental outcomes in children up to three years of age.
- To determine if low-level fetal lead exposure impacts early childhood development.
Main Methods:
- A prospective cohort study of 318 children born in Sydney.
- Collection of maternal and cord blood samples for lead level analysis.
- Regular neurobehavioral and physical assessments from 6 months to 5 years of age.
Main Results:
- Maternal and cord blood lead levels ranged from 0-29 microgram/dl, with geometric means of 9.1 and 8.1 microgram/dl, respectively.
- Analyses of data from the first three years did not support a relationship between these lead levels and developmental deficits.
- No significant association was found between fetal lead exposure and child development up to three years.
Conclusions:
- Low-level fetal lead exposure, as measured by maternal and cord blood lead levels in this study, does not appear to be associated with developmental deficits in children by age three.
- Further research may be warranted to explore potential effects at different exposure levels or developmental stages.
- These findings contribute to the understanding of environmental influences on early child development.
Abstract:
A cohort of 318 children born in three Sydney hospitals between April 1982 and March 1983 were recruited into a five year prospective study designed to investigate the relationship between low level lead exposures and neurobehavioural development. Blood samples were obtained at the time of birth, then at 6 month intervals to 4 years and then at 5 years; neurobehavioural and physical measures were taken at 6 months, 12 months and hence annually to 5 years. This paper presents some of the findings from the first three years of the study and addresses the issue of the relationship between fetal exposures to lead and child development to three years. Maternal and cord blood lead levels were in range 0-29 microgram/dl with the majority less that 15 micrograms/dl. The geometric means were, respectively, 9.1 micrograms/dl and 8.1 micrograms/dl. The analyses presented do not support the hypothesis of a relationship between maternal and cord blood lead levels in this range and developmental deficits in young children to the age of three years.