This brief summarizes evidence from existing studies on the impact of early childhood home visiting on children 5 and older for four national models of home visiting. (mdrc.org)
The central weakness in existing studies of bilingual education is that they do not attempt to separate the benefits of growing up in a bilingual household from the effects of receiving bilingual instruction. (educationnext.org)
Existing studies do not address the possible preventive or long - term effects of these supplements and diets, and if animals consuming them will live longer or have a lower incidence of disease. (scielo.br)