Figure 1.

An elevated concentration of interleukin-6 (IL-6) is observed in aged subjects. IL-6 levels were measured by ELISA and concentration values above 4.7 pg/mL were considered detectable. (A) Elderly individuals have a higher concentration of IL-6 than adults (*** p < 0.001); and (B) there is a high variability among Robust, Frail and Non-autonomous elderly, but an increasing concentration with dependency can be observed. Each dot shows the concentration of a subject and the line represents the average value of the group.