IL31 and allergic disease: Nevertheless, we observed that the levels of IL-31 and IL-33 were not statistically different in patients with AAR and AR with deficient, insufficient, and sufficient levels of 25(OH) Vit D. Indeed the fact that we even observed higher levels of IL-31 and IL-33 in patients with AAR showing insufficient and sufficient 25(OH) Vit D levels further underlined the lack of relationship between 25(OH) Vit D IL-31 and IL-33 in allergic disease.