[Blood lead levels and poor school performance among children in Mexico City].

Objective: To describe the relationship between blood lead levels (BLL) and poor school performance.

Material And Methods: A cross-sectional study was carried out in 1996 among 792 schoolchildren aged 7-14 years, who attended the outpatient units of five pediatric hospitals of Mexico City. BLL was measured together with lead exposure and academic performance.

[Blood lead levels and exposure factors in children of Morelos state, Mexico].

Objective: To assess blood lead levels and lead exposure factors in children living in Morelos State, Mexico.

Material And Methods: A cross-sectional study was conducted between June and October 1996, in 232 children aged 1-12 years, at Hospital del Niño Morelense de Cuernavaca, Morelos, Mexico. Blood lead levels were measured by anodic voltameter, and exposure factors were collected by questionnaire.