Figure 3 : The relationship between handgrip strength and functional fitness test outcomes.

The vertical dashed lines indicate the empirically derived handgrip strength cutoff of 30 kg. The horizontal solid lines represent the mean performance of subjects with a handgrip strength ≥30 kg, and the shaded horizontal region represents ±2 standard deviations from that mean. PPV=Positive Predictive Value (true positive), the percentage of subjects with a handgrip strength <30 kg and a functional fitness test result more than 2 standard deviations below the mean of reference group. NPV=Negative Predictive Value (true negative), the percentage of subjects with a handgrip strength ≥30 kg and a functional fitness test performance within 2 standard deviations of the mean of the reference group.