Fig. 2

Evolution of the relationship between mean and SD for representative indices among age groups ≥45 years. The relationship between the set of relative coefficients of variations (CV) and relative mean values are shown. The 45–59 years age group was set as a standard for both CV and means. The mean of all the indices decreased to a large degree in the older population. Each point indicates the age groups of 45–59, 60–74, 75–89, and ≥90 years. Open circles, %CGR; open squares, Alb; open triangles, Cr; closed circles, nPCR; closed squares, phosphate; closed triangles, body weight reduction; gray circles, body weight; and gray squares, body mass index