Fig. 6: High correlation between the Body Clock and disease-based frailty index (FI) with BLSA (r = 0.83, 95% CI: 0.816–0.84).
From: Health octo tool matches personalized health with rate of aging

Body Clock also captures heterogeneity better than FI: for heterogeneous values of the Body Clock—serving as a proxy for the intrinsic age and health entropy—FI values remain largely unchanged. Sample size n = 907, Women = 451.