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Association of low lead levels with behavioral problems and executive function deficits in schoolers from Montevideo, Uruguay
Barg, G.; Daleiro, M.; Queirolo, E.; Ravenscroft, J.; Mañay, N.; Peregalli, F.; Kordas, K. (2018). Association of low lead levels with behavioral problems and executive function deficits in schoolers from Montevideo, Uruguay. International Journal of Environmental Research and Public Health 15(12): 2735. https://dx.doi.org/10.3390/ijerph15122735
In: International Journal of Environmental Research and Public Health. MDPI AG: Basel. ISSN 1660-4601
|   |
| Author keywords |
lead exposure; child’s behavior; ADHD; executive functions |
| Auteurs | | Top |
- Barg, G.
- Daleiro, M.
- Queirolo, E.
- Ravenscroft, J.
|
- Mañay, N.
- Peregalli, F.
- Kordas, K.
|
|
| Abstract |
The negative effect of lead exposure on children’s intelligence is well-documented. Less is known about the impact of lead on the use of executive functions to self-regulate behavior. We measured blood lead level (BLL) in a sample of first grade children from Montevideo, Uruguay (n = 206, age 6.7 ± 0.5 years, 59.7% boys). Behavior was assessed with teacher versions of the Conners Rating Scale (CRS) and the Behavior Rating Inventory of Executive Functions (BRIEF). Mean BLL was 4.2 ± 2.1 μg/dL; 10% had mild-to-severe ratings of Attentional Deficit with Hyperactivity Disorder (ADHD) (T score > 65). In negative binomial regression, BLL was not associated with CRS sub-scales, but was associated with a poorer ability to inhibit inappropriate behaviors, prevalence ratio (PR) [95% CI]: 1.01 [1.00, 1.03] as measured by the BRIEF. In covariate-adjusted models, the association with BLL was attenuated. When stratified by sex, the covariate-adjusted association between BLL, hyperactivity, poorer inhitibion, emotional control, and behavioral regulation was marginally significant for girls but not boys. In summary, among children with low lead-exposure, we found some, but nonetheless modest, evidence of a relationship between higher BLL and child behavior. If confirmed by larger studies and other objective measures of behavior, such links could have implications for learning and social interaction, particularly among girls. |
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