Fig. 1
![Fig. 1](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs12877-020-01601-z/MediaObjects/12877_2020_1601_Fig1_HTML.png)
Predictive variables, classified using the Clinical Frailty Scale (CFS). Data are means + standard deviation (SD). P values for linear regressions were determined using the Jonckheere-Terpstra test. * p < 0.05, ** p < 0.01, *** p < 0.001 vs. CFS1, determined by multiple comparison using Fisher’s LSD test, following analysis of variance (ANOVA). For body mass, * p < 0.05, ** p < 0.01, *** p < 0.001 vs. CFS7, determined using Fisher’s LSD multiple comparison method, following ANOVA (p = 0.025)