RESUMEN
OBJECTIVE: To study the magnitude of risk factors known for asthma in 6-10 year-old children. MATERIAL AND METHODS: This is a case- and control-study with 6-10 year-old children; 58 were asthmatic and 117 were control, with a relation 2:1. Asthmatic patients were recruited from consult of immuno-allergies department and control patients, from familial medicine consult of Hospital de Especialidades 71, IMSS. Indirect (mother) and directed surveys were applied, they were of multiple option for exploring the most known in literature-risk factors. Statistical management was performed by odds ratio with confidence interval of 95%. RESULTS: The following variables were considered risk factors: ingestion of artificial colorants before having 1 year old (OR = 13.2), living in an urban area (OR = 7.74), maternal smoking during pregnancy (OR = 2.4), wool contact before having 1 year old (OR = 2.11), passive smoking exposure during pregnancy (OR = 1.486) and feeding with industrialized milk (OR = 1.2). CONCLUSIONS: Environmental risk factors are very important in our population, as well as early ablactation; however, ingestion before having 1 year old of allergens as egg, chocolate, orange and mango was not considered risk factor.