Table 4.

Accuracy errors E in mm for each subject and each algorithm between the true GHJC and the estimated one

Algorithm	Subject 1	Subject 2	Subject 3	Subject 4	Subject 5	Mean
${\text{NAP}}^{\left(1\right)}$	16.4 ± 7	37.3 ± 10	11.2 ± 4	21.3 ± 3	17.3 ± 5	20.7 ± 10
${\text{NAP}}_{\mathrm{\omega }}^{\left(1\right)}$	15.9 ± 7	37.5 ± 10	11.2 ± 4	21.1 ± 3	17.3 ± 5	20.6 ± 10
${\text{NAP}}_{\mathrm{\omega }\text{a}}^{\left(2\right)}$	18.0 ± 6	38.5 ± 10	12.4 ± 7	19.8 ± 4	18.5 ± 6	21.4 ± 11
${\text{SSFC}}^{\left(2\right)}$	29.3 ± 5*	37.9 ± 10	29.4 ± 10*	22.2 ± 6*	30.7 ± 9*	29.9 ± 10
${\text{SAC}}^{\left(2\right)}$	22.6 ± 5	33.8 ± 11	12.6 ± 5	21.6 ± 3	19.1 ± 4	21.9 ± 9

Mean ± STD. A star indicates a statistically significant difference between that specific algorithm (on that subject) and all the other algorithms, with p < 0.005 (Student’s t test with Bonferroni’s correction)