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OBJECTIVE Low-level postnatal lead exposure is associated with poor intellectual development in children, although effects of prenatal exposure are less well studied. We hypothesized that prenatal lead exposure would have a more powerful and lasting impact on child development than postnatal exposure. DESIGN We used generalized linear mixed models with(More)
This paper presents a proposal that aims to cover some tasks required in the Database Reengineering process, mainly in the Conceptual Abstraction phase. The principal tasks are: the transformation of enriched logical schema to object-oriented schema, support for process iterations and support for data migration from the legacy database to the new database.(More)
Using the Bayley test, the mental and psychomotor development in a cohort of 253 children were evaluated. Maternal dietary intake of vitamin B(12) and folate was assessed from a semiquantitative questionnaire administered during the first trimester of pregnancy. Maternal genotypes of MTHFR (677C>T and 1298A>C), were ascertained by PCR-RFLP. The 677T and(More)
We determined the secular trend in blood lead levels in a cohort of 321 children born in Mexico City between 1987 and 1992. Blood lead level was measured every 6 months during a 10-year period. We modeled the effect of yearly air lead concentration nested within the calendar year in which the child was born, family use of lead-glazed pottery, socioeconomic(More)
en forma verbal y la presencia de límites claros. Abstract Objective. To identify the relationship between stimulation at home and motor development among 36 month-old children. Materials and Methods. The development of gross and fine motor skills of 169 infants (50.9% boys and 49.1% girls) was assessed at the age of 36 months with the Peabody Developmental(More)