Table 5.

Sensitivity (SE), specificity (SP) and accuracy (AC) after training with young adults and validating either with young adults or elderly people.

Feature	Young			Elderly
	SE	SP	AC	SE	SP	AC
$C_2$	94.28	96.13	95.21	77.33	97.67	87.49
$C_3$	98.53	80.50	89.51	84.00	96.42	90.21
$C_8$	95.54	96.38	95.96	85.33	98.10	91.72
$C_9$	97.79	80.70	89.25	88.00	96.42	92.21
$C_{13}$	92.56	94.41	93.49	62.67	95.19	78.93