It was surprising that IL-6, called “a cytokine for gerontologists” [17], showed poor diagnostic usefulness to distinguish the individuals with anemia from no-anemia ones (AUC = 0.523, sensitivity 62.2%, specificity 51.1%, OR = 1.939, 95%Cl 0.848–4.489) compared to other cytokines (Table 5). Here, IL6 is linked to anemia.