Fig. 2

Accuracy comparison between non-normalized, ratio standard/muscle quality and allometric scaling of muscle weakness cut-off points of HGS and lower limbs strength (1RM and PT) in older men (letters a, b, c) and older women (letters d, e, f). *p < 0.05 and ^†p < 0.001 (statistically significant AUC). ^‡p < 0.05 (greater than the AUC of non-normalized muscle strength). ^§p < 0.05 (greater than the AUC of the allometric scaling). Dependent variable (primary outcome): functional limitation (6MWT < 400 m). HGS handgrip strength; 1RM one maximum repetition measurement for knee extensors, PT isokinetic knee extension peak torque at 60º/s, 6MWT six-minute walk test