Table 3. Testing .
E1 | E2 | E1+E2 | |
(two-tailed) | 1 | 1 | 1 |
is rejected for probability values less than 5% (paired t-test).
Whereby the two stiffnesses Eqs. (1) and (2) are equal across subjects. The mean normalized difference of the two stiffnesses and its standard deviation (inter-subject variability). Data were discarded such that mean in force of both data sets align.