## Results
### GripControl Comfort  
Regarding grip comfort, the effects of curvature and usage pattern were not significant (Table 5). Comparing them descriptively, the sample with a curvature of 8R scored the highest, followed by 6R, 4R, and 10R (Table 3). However, the interaction effect between curvature and usage pattern was significant: \(F(9,360)=2.324\), \(p=0.005\). Because the grip comfort has an interaction effect between curvature and usage pattern, it was analyzed separately according to the samples and usage patterns (Table 6). In the case of samples, 10R showed a significant difference in grip comfort between the usage patterns: \(F(3,159)=4.269\), \(p=0.006\). Post hoc analysis showed two homogeneous subsets. The first subset comprised usage patterns of (b), and (c) (M\({}_{\rm b}\) = 4.750, M\({}_{\rm c}\) = 5.200), and the second subset comprised usage patterns of (a), (b), and (d) (M\({}_{\rm a}\) = 4.450, M\({}_{\rm b}\) = 4.750, M\({}_{\rm d}\) = 4.175). In the case of usage patterns, however, all patterns showed no significant differences in grip comfort between samples. \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline
**Evaluation** & \multicolumn{3}{c}{**Sum of**} & \multicolumn{3}{c}{**Mean**} & \multicolumn{1}{c}{**\(F\)**} & \multicolumn{1}{c}{**\(p\)**} & \multicolumn{1}{c}{\(\eta_{p}^{2}\)**} \\
**Factor** & **Source** & **Type III** & & & **Square** & & \\ \hline \multirow{3}{*}{\begin{tabular}{c} Grip Comfort \\ \end{tabular} } & Gender & 3.525 & 1 & 3.525 & 0.418 & 0.522 & 0.011 \\  & Hand Type & 6.500 & 1 & 6.500 & 0.770 & 0.386 & 0.021 \\  & Gender \(\times\) Hand Type & 11.157 & 1 & 11.157 & 1.321 & 0.258 & 0.035 \\ \hline \multirow{3}{*}{\begin{tabular}{c} Control \\ \end{tabular} } & Gender & 0.000 & 1 & 0.000 & 0.000 & 0.995 & 0.000 \\  & Hand Type & 12.238 & 1 & 12.238 & 1.101 & 0.301 & 0.030 \\  & Gender \(\times\) Hand Type & 2.438 & 1 & 2.438 & 0.219 & 0.642 & 0.006 \\ \hline \multirow{3}{*}{Stability} & Gender & 0.156 & 1 & 0.156 & 0.019 & 0.892 & 0.001 \\  & Hand Type & 0.306 & 1 & 0.306 & 0.036 & 0.850 & 0.001 \\  & Gender \(\times\) Hand Type & 6.602 & 1 & 6.602 & 0.785 & 0.382 & 0.021 \\ \hline \multirow{3}{*}{\
\begin{tabular}{c} Front \\ \end{tabular} } & Gender & 2.377 & 1 & 2.377 & 0.710 & 0.405 & 0.019 \\  & Hand Type & 8.327 & 1 & 8.327 & 2.488 & 0.123 & 0.065 \\ \cline{1-1}  & Gender \(\times\) Hand Type & 0.077 & 1 & 0.077 & 0.023 & 0.881 & 0.001 \\ \hline \multirow{3}{*}{
\begin{tabular}{c} Side \\ \end{tabular} } & Gender & 0.127 & 1 & 0.127 & 0.029 & 0.867 & 0.001 \\  & Hand Type & 3.452 & 1 & 3.452 & 0.779 & 0.383 & 0.021 \\ \cline{1-1}  & Gender \(\times\) Hand Type & 0.827 & 1 & 0.827 & 0.187 & 0.668 & 0.005 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Test result of between subject effects (based on the results of two mixed ANOVAs). \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**Source** & \multicolumn{2}{c}{**Sum of Squares**} & \multirow{2}{*}{**df**} & \multicolumn{2}{c}{**Mean**} & \multirow{2}{*}{\(F\)} & \multirow{2}{*}{\(p\)} & \multirow{2}{*}{\(\eta_{p}^{2}\)**} \\  & **Type III** & & & **Square** & & & \\ \hline \multirow{3}{*}{
\begin{tabular}{c} Sample \\ Error (Sample) \\ Pattern \\ \end{tabular} } & 7.517 & 3 & 2.506 & 1.552 & 0.205 & 0.038 \\  & 188.920 & 117 & 1.615 & & & \\ \cline{1-1}  & 7.142 & 3 & 2.381 & 0.931 & 0.428 & 0.023 \\ \cline{1-1}  & 299.295 & 117 & 2.558 & & & \\ \cline{1-1}  & 20.914 & 9 & 2.324 & 2.666 & 0.005 & 0.064 \\ \cline{1-1}  & 305.898 & 351 & 0.872 & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 5: Results of four-way mixed ANOVA for grip comfort (Test result of within subject effects). For the control comfort, the effect of curvature was significant: \(F(3,120)=7.590\), \(p<0.001\) (Table 7). Post hoc analysis using [PERSON]'s test showed three homogeneous subsets. The first subset comprised the samples with curvatures of 8R and 10R. The second subset comprised the samples with curvatures of 6R and 8R, and the last subset comprised the samples with curvatures of 4R and 6R.