Fig. 4
Correlation matrix (reporting the coefficient of determination R2) including all objective activity parameters, the subjective frailty scores, and the dimensions gait and activity derived from the confirmatory principal component analysis. Frailty 0:5, Frailty red. reduced frailty score 0:3, MADmean mean of all MAD values, MADstd standard deviation of all MAD values, MADrel relative amount time spend in MAD levels > 100 m-g, MADmedian median of all MAD values, MAD95 95th percentile of all MAD values, MADfrag standard deviation of the first derivate of the MAD time-series in milli-g, STEP95 95th percentile of cadence in steps per minute, STEPmean average number of steps taken per 5 s