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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)
The world population pyramid has changed shape. However, this does not mean that societies have changed their negative concept of old age. Our study proposes an intergenerational service-learning program with 179 university students and 101 slightly depressed elderly people. The results show that the elderly people who interacted improved in well-being.(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)