Conclusion
This large population-based study of allergic patients in mainland China found that the prevalence of allergens displayed obvious and distinctive patterns among regions, age groups and seasons. Based on previous studies, the reasons for the above results may include lifestyle factors, socioeconomic factors, genetic predispositions, climate, sexual hormones, cross-reactivity and so on. The factors were so complicated that deeper studies are needed. Our article may help clinicians find effective individualized treatments for unique patient groups. Researchers may obtain some instructions for deeper studies on the epidemiology of allergic diseases.