# Test-Retest Reliability of a 6 DoF Marker Set for Gait Analysis in Cerebral Palsy Children
## 2 Materials and Methods
### Statistical Methods  
Statistical analysis to assess test-retest reliability of the gait kinematic and kinetic data was carried out using the method described by [PERSON] et al. (2014) and [PERSON] et al. (2011). Intraclass correlation coefficients considering the two-way mixed model, and absolute agreement (ICC[A,k]) (Stein \begin{table}
\begin{tabular}{l l c c c c c c c c c} \hline \hline \multicolumn{1}{c}{**Ambropometric**} & \multicolumn{1}{c}{**ICC**} & \multicolumn{1}{c}{**ICC**} & \multicolumn{1}{c}{**ICC 95\% CI**} & \multicolumn{1}{c}{**Mean**} & \multicolumn{1}{c}{**Mean**} & \multicolumn{1}{c}{**Mean Diff**} & \multicolumn{1}{c}{**Mean Diff 95\% CI**} & \multicolumn{1}{c}{**SD\({}_{\textit{MF}}\)**} & \multicolumn{1}{c}{**95\% LOA**} & \multicolumn{1}{c}{**SEM**} \\ \hline \multicolumn{1}{c}{\
\begin{tabular}{l} Petivis Segment \\ Depth \\ (cm) \\ \end{tabular} } & 0.98 & (0.93,0.99) & 13.2 & 0.2 & (\(-0.2\), 0.7) & 0.6 & (\(-0.97\), 1.40) & 0.4 \\ Inter & ASS Distance & 0.98 & (0.94,0.99) & 17.3 & \(-0.1\) & (\(-0.7\), 0.3) & 0.6 & (\(-150\), 1.13) & 0.4 \\ Light Tight Segment & 0.99 & (0.97,0.99) & 26.6 & \(-0.1\) & (\(-0.7\), 0.4) & 0.7 & (\(-1.55\), 1.20) & 0.5 \\ Light Light Segment & 0.99 & (0.89,0.99) & 26.7 & \(-0.5\) & (\(-0.9\), 0.1) & 0.4 & (\(-150\), 0.42) & 0.3 \\ Right Light Segment & 0.99 & (0.85,0.99) & 25.8 & 0.1 & (\(-0.7\), 0.8) & 0.9 & (\(-1.86\), 1.85) & 0.6 \\ Light Light Segment & 0.99 & (0.87,0.99) & 25.9 & 0.3 & (\(-0.0\), 0.7) & 0.4 & (\(-0.53\), 1.22) & 0.3 \\ Light Light (cm) & 0.97 & (0.86,0.99) & 8.8 & 0.1 & (\(-0.2\), 0.4) & 0.4 & (\(-0.76\), 0.96) & 0.3 \\ Light Light Segment & 0.96 & (0.83,0.99) & 9.0 & 0.1 & (\(-0.3\), 0.5) & 0.5 & (\(-1.01\), 1.21) & 0.4 \\ Light Light Segment & 0.49 & (0.83,0.99) & 9.0 & 0.1 & (\(-0.3\), 0.5) & 0.5 & (\(-1.01\), 1.21) & 0.4 \\ \hline \multicolumn{1}{c}{
\begin{tabular}{l} Interclass correlation coefficient, ICC; 95\% CI, 95\% confidence interval for the ICC; mean, mean of measurements at baseline trial and retest trial; mean diff, mean of the differences between measurements at times 1 and 2 and the 95% CI for mean diff, the standard deviation of the differences (SD\({}_{\textit{MF}}\)):95% LOA, [PERSON] and Altman 95\% limits of agreement; SEM, standard error of measurement.} \\ \end{tabular} } \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Reliability values for anthropometric measurements. \begin{table}
\begin{tabular}{l l c c c c c c c} \hline \hline \multicolumn{1}{c}{**Left Lower Limb**} & \multicolumn{3}{c}{**Right Lower Limb**} \\ \hline \multicolumn{1}{c}{**Subject**} & \multicolumn{1}{c}{**Affected Side**} & \multicolumn{1}{c}{**Height (cm)**} & \multicolumn{1}{c}{**Mass (deg)**} & \multicolumn{1}{c}{**True Log Length**} & \multicolumn{1}{c}{**Significant Gain**} & \multicolumn{1}{c}{**Significant Gain**} & \multicolumn{1}{c}{**Significant Gain**} & \multicolumn{1}{c}{**Significant Gain**} & \multicolumn{1}{c}{**Significant Gain**} \\ \multicolumn{1}{c}{**Pattern**} & \multicolumn{1}{c}{**Abbreviation Scale**} & \multicolumn{1}{c}{**(cm)**} & \multicolumn{1}{c}{**Between**} & \multicolumn{1}{c}{**Abbreviation Scale**} & \multicolumn{1}{c}{**(cm)**} & \multicolumn{1}{c}{**Between**} & \multicolumn{1}{c}{**Abbreviation Scale**} \\ \hline
001 & Bilateral & 1.09 & 19.5 & 81.5 & True opinions [16] & 1+ & 54.5 & True opinions [16] & 2 \\
002 & Unilateral & 1.14 & 26.0 & 84.6 & Normal & 0 & 54.3 & True opinions [16] & 2 \\
003 & Bilateral & 1.32 & 26.0 & 66 & Aperture opinions & 1+ & 66 & Aperture opinions & 1+ \\
004 & Unilateral & 0.98 & 13.5 & 46 & True opinions [16] & 1+ & 48 & Normal & 0 \\
005 & Bilateral & 1.37 & 34 & 71 & Aperture opinions & 2 & 70.5 & Aperture opinions & 2 \\
006 & Unilateral & 1.32 & 37 & 70.2 & Normal & 0 & 70.1 & Aperture opinions & 1+ \\
007 & Bilateral & 1.06 & 15.5 & 52 & True opinions [16] & 3 & 28.7 & True opinions [16] & 3 \\
008 & Bilateral & 1.10 & 18 & 54 & Jump goal [16] & 2 & 54.5 & Jump goal [16] & 2 \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Subject characteristics.