Figure 1:
(A) Mean values of Frailty Index at each study cycle as a function of age (n = 14 127, population-weighted). (B) Proportion of participants with each health status at baseline, as a function of age (n = 14 127, population-weighted). Definitions of fitness categories: relatively fit, Frailty Index ≤ 0.03; less fit, 0.03 < Frailty Index ≤ 0.10; least fit, 0.10 < Frailty Index ≤ 0.21; and frail, Frailty Index > 0.21.