Index: LILACS (Americas) Main subject: Socioeconomic Factors / Biological Factors / Child Development / Psychology, Child / Risk Factors / Motivation Type of study: Etiology study / Risk factors Limits: Child / Child, preschool / Female / Humans / Male Country/Region as subject: South America / Venezuela Language: Spanish Journal: Niños (Caracas) Journal subject: Neurology / Pediatrics / Psychiatry Year: 1996 Type: Article