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Table 5 Accuracy error E r (mean ± STD) in mm for each subject and each algorithm between estimated radius and the actual one measured by MRI

From: In vivo estimation of the shoulder joint center of rotation using magneto-inertial sensors: MRI-based accuracy and repeatability assessment

Algorithm Subject 1 Subject 2 Subject 3 Subject 4 Subject 5 Mean
\({\text{NAP}}^{\left( 1 \right)}\) 9.2 ± 6 12.9 ± 9 7.7 ± 3 4.3 ± 3 10.0 ± 6 8.81 ± 6
\({\text{NAP}}_{\upomega }^{\left( 1 \right)}\) 8.6 ± 6 12.6 ± 9 8.0 ± 3 4.1 ± 2 10.2 ± 6 8.7 ± 6
\({\text{NAP}}_{{\upomega{\text{a}}}}^{\left( 2 \right)}\) 8.5 ± 8 15.0 ± 10 8.0 ± 6 7.5 ± 5 10.8 ± 9 10.0 ± 8
\({\text{SSFC}}^{\left( 2 \right)}\) 13.9 ± 10* 23.2 ± 15* 17.9 ± 10* 15.6 ± 8* 14.6 ± 11* 17.1 ± 11
\({\text{SAC}}^{\left( 2 \right)}\) 8.1 ± 5 12.7 ± 15 6.1 ± 4 6.6 ± 4 5.8 ± 5 7.9 ± 8
  1. * 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)