[Risk factors related to allergic diseases at Mexico City].

Background: Several studies suggest that the prevalence of allergic diseases has been increasing worldwide in recent years; then it is very important to identify some risk factors that could be related.

Objective: To know some hereditary and environmental risk factors that could be related to the development of allergic diseases in open population from Mexico City.

Patients And Method: It was an open-population, cross-sectional trial, in two phases with a random sample size of 4272 individuals in 214 public health centers.

[Prevalence of allergic diseases in Mexico City].

Background: There is a considerable variation in the prevalence of allergic disorders in developing countries. These differences may be attributable to different methodological problems and to the lack of operational definitions. Several studies suggest that the prevalence of allergic diseases has been increasing worldwide in recent years.