Autism spectrum disorders and atopic dermatitis: a new perspective from country-based prevalence data.

Recently, a continuous growth for both neurodevelopmental and atopic diseases' incidence was seen throughout the world. Notably, autism spectrum disorders (ASD) and atopic dermatitis (AD) attracted the attention of clinicians and scientists for their impact on the quality of life of patients, starting during childhood. Despite a number of hypotheses about common pathogenesis between the two disorders, uncertainty is still present, and data coming from various parts of the world are contradictory. Fortunately, works recently published have brought useful material for comparative analysis to the benefit of the scientific community, making large scale, country-based perspectives methodologically viable. In light of that, the present study took into account uniform data, available from country-based registries or related publications, dealing with the prevalence of the two conditions around the world, and tried to setup a simple correlation analysis between the two. According to such data, the growth of AD and ASD prevalence appear uncorrelated, leading to hypothesise that, if a common etiopathological pathway exists between the two conditions, they are likely to interact to each other due to a complex interplay of co-morbidities, genes and environmental players not enough explained by a simple correlation analysis. Such facts are worth investigation in future research.