Résumé :
|
[BDSP. Notice produite par INIST l3eR0xKU. Diffusion soumise à autorisation]. Objective. Lead is a confirmed neurotoxicant, but the lowest blood lead concentration associated with deficits in cognitive functioning anc academic achievement is poorly definec. The purpose of the present study was to examine the relationship of relatively low blood lead concentrations-especially concentrations=10 mug/dL. After adjustment for gender, race/ethn city, poverty, region of the country, parent or caregiver's educational level, parent or caregiver's marital status parent, serum ferritin level, and serum cotinine leve, the data showed an inverse relationship between blood lead concentration and scores on four measures of cognitive functioning. For every ! mug/dL increase in blooc lead concentration, there was a 0.7-point decrement in mean arithmetic scores, an approximately I-point decrement n mean reading scores, a 0.1-point decrement in mean scores on a measure of nonverbal reasoring, and a 0.5-point decrement in mean scores on a measure of short-term memory, An inverse relationship between blood lead concentration and arithmetic and reading scores was observed for children with blood lead concentrations lower than 5.0 mug/dL Conclusion. Deficits n cognitive and academic skills associated with lead exposure occur at blood lead concentrations lower than 5 mug/dL.
|