Figure 4. Effect of the Interaction between Various Types of Exposures and Various Genetic Backgrounds in a Range of Racial and Ethnic Groups on the Prevalence of Asthma through Pathways Involving Atopy, Airway Inflammation, Airway Hyperresponsiveness (AHR), or Other, Unknown Factors. Data on farming environments are from Braun-Fahrlander and Lauener; data on occupational exposures are from Mapp et al.; data on mainland China are from Wong et al.; data on innercity United States are from Gruchalla et al.; data on affluent countries are from Schaub and von Mutius, van Vliet et al., Oosterlee et al., Strachan and Cook, Strachan et al., and Karmaus and Botezan; data on eastern European countries are from Bjorksten et al.; and data on developing countries are from Yazdanbakhsh and Wahyuni.