Table 1.

Representative surface wave speeds of a healthy subject and a patient at four locations of skin at 100 Hz, 150 Hz and 200 Hz.

Healthy [m/s]	R4	R5	L4	L5
100 Hz	1.97 ± 0.31	1.7 ± 0.28	1.83 ± 0.04	1.79 ± 0.07
150 Hz	2.31 ± 0.08	2.5 ± 0.13	2.33 ± 0.25	2.52 ± 0.41
200 Hz	2.82 ± 0.19	2.99 ± 0.18	3.04 ± 0.37	3 ± 0.19
Patients	R4	R5	L4	L5
100 Hz	3.42 ± 0.27	2.22 ± 0.25	2.82 ± 0.31	2.47 ± 0.22
150 Hz	4.52 ± 0.59	2.52 ± 0.35	3.6 ± 0.38	3.67 ± 0.25
200 Hz	5.17 ± 0.57	3.04 ± 0.23	5.36 ± 0.55	5.78 ± 0.64