Fig. 2

Frailty-free survival curves by groups with high and low power and speed scores according to the multivariate Cox regression analysis. The patients were classified into two groups based on the cut-off values (Yoden index) of power and speed scores. The blue and gray lines show groups with higher and lower scores, respectively. The mCHS-defined frailty-free survival curves of the two groups according to the a power scores or b speed scores and KCL-defined frailty-free survival curves of two groups according to the c power scores or d speed scores are calculated using the Cox regression analysis after adjusting for age, sex, BMI, dyslipidemia, diabetes, hypertension, heart failure, stroke, habitual drinker, and smoking. The frailty-free survivals of two groups were significantly different (a power score, P = 0.001; b speed score, P = 0.008; c power score, P = 0.014; and d speed score, P = 0.003, Cox regression analysis). BMI, body mass index