## 2 Materials and Methods
### Variables
\begin{table}
\begin{tabular}{c c c c c c} \hline \hline  & \multicolumn{2}{c}{**FIRST WEEK**} & \multicolumn{2}{c}{**SECOND WEEK**} & \multicolumn{2}{c}{**BOTH WEKS**} \\ \cline{2-6}
**Protocol, Foot, and** & **95\% CI** & \multicolumn{2}{c}{**95\% CI**} & \multicolumn{2}{c}{**95\% CI**} \\ \cline{2-6}
**Biomechanical Phase** & **ICC** & \multicolumn{2}{c}{**ICC**} & \multicolumn{2}{c}{**ICC**} & \multicolumn{2}{c}{**ICC**} \\ \cline{2-6}  & **(Lower** & **SEM** & **(Lower** & **SEM** & **(Lower** & **(Lower** & **Limit–Upper Limit)** \\  & **Limit–Upper Limit)** & & **Limit–Upper Limit)** & & **SEM** \\ \hline First step, Left foot, 20\% & 0.600(0.489-0.708) & 8.18 & 0.674(0.573-0.767) & 7.30 & 0.809(0.698-0.882) & 5.34 \\ First step, Right foot, 20\% & 0.555(0.440-0.671) & 8.58 & 0.507(0.389-0.629) & 7.50 & 0.724(0.575-0.826) & 5.76 \\ First step, Left foot, 35\% & 0.691(0.594-0.781) & 6.79 & 0.737(0.649-0.816) & 6.29 & 0.888(0.819-0.932) & 3.98 \\ First step, Right foot, 35\% & 0.653(0.549-0.751) & 6.72 & 0.725(0.633-0.807) & 6.01 & 0.875(0.798-0.924) & 3.91 \\ First step, Left foot, 92\% & 0.357(0.239-0.492) & 5.29 & 0.472(0.352-0.598) & 4.96 & 0.611(0.423-0.749) & 3.76 \\ First step, Right foot, 92\% & 0.400(0.280-0.532) & 5.58 & 0.365(0.246-0.499) & 4.78 & 0.611(0.422-0.749) & 3.71 \\ Second step, Left foot, 20\% & 0.655(0.552-0.753) & 7.53 & 0.629(0.521-0.732) & 6.99 & 0.797(0.681-0.874) & 5.19 \\ Second step, Right foot, & 0.629(0.522-0.732) & 7.75 & 0.601(0.490–0.709) & 7.49 & 0.783(0.660-0.865) & 5.41 \\ Second step, Left foot, 35\% & 0.769(0.688-0.840) & 5.45 & 0.663(0.560–0.759) & 5.68 & 0.879(0.805-0.927) & 3.57 \\ Second step, Right foot, & 0.752(0.667-0.827) & 5.35 & 0.7160(0.623–0.800) & 5.72 & 0.848(0.757-0.907) & 4.03 \\ Second step, Left foot, & 0.224(0.117-0.357) & 4.93 & 0.337(0.220–0.472) & 4.96 & 0.653(0.478-0.778) & 3.13 \\ Second step, Right foot, & 0.324(0.207-0.461) & 5.38 & 0.392(0.273–0.525) & 4.79 & 0.681(0.514–0.798) & 3.23 \\ Third step, Left foot, 20\% & 0.655(0.551-0.753) & 6.63 & 0.692(0.594–0.781) & 6.63 & 0.791(0.672–0.870) & 5.02 \\ Third step, Right foot, & 0.599(0.488-0.708) & 7.90 & 0.739(0.651–0.818) & 6.38 & 0.726(0.578–0.827) & 6.07 \\ Third step, Left foot, 35\% & 0.742(0.655-0.820) & 5.84 & 0.765(0.683–0.837) & 5.74 & 0.885(0.814–0.930) & 3.84 \\ Third step, Right foot, & 0.762(0.679-0.835) & 5.66 & 0.741(0.653–0.819) & 5.55 & 0.870(0.790–0.920) & 3.93 \\ Third step, Left foot, 92\% & 0.267(0.156-0.402) & 4.67 & 0.351(0.234–0.486) & 4.96 & 0.678(0.512–0.795) & 3.02 \\ Third step, Right foot, & 0.304(0.189-0.440) & 4.79 & 0.180(0.079–0.310) & 4.67 & 0.478(0.255–0.653) & 3.53 \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Intra-class correlation coefficient (ICC) and standard errors of the mean (SEM) for Contact Surface Areas, Females. 0.20 or less, slight agreement; 0.21 to 0.40, fair; 0.41 to 0.60, moderate; 0.61 to 0.80, substantial; and 0.81 or greater, almost perfect. We calculated standard errors of the mean (SEM) to measure the range of error in each parameter. We computed the SEM as \(s_{x}\)-\(\sqrt{(}1\)-\(r_{xx})\), where \(s_{x}\) is the standard deviation of the observed set of test scores, and \(r_{xx}\) is the reliability coefficient, which, in our case, is the ICC. Additionally, we performed Student's t tests to compare males' and females' means for each parameter. We considered a \(p\) value \(<0.05\) as statistically significant for all tests. We used SPSS for Windows, version 20.0 (SPSS Inc., Chicago, IL, USA), for all statistical analyses.