## Results
### GripControl Comfort
Moreover, the interaction effect between curvature and usage pattern was significant: \(F(9,360)=4.526\), \(p<0.001\). Because the control comfort has an interaction effect between curvature and usage pattern, it was analyzed separately according to the samples and usage patterns (Table 8). In the samples, 10R showed a significant difference in grip comfort between the usage patterns: \(F(3,159)=4.550\), \(p=0.004\). Post hoc analysis showed two homogeneous subsets. The first subset comprised usage patterns of (a), (c), and (d), and the second subset comprised curvatures of (b), and (c). \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multirow{2}{*}{**Source**} & \multicolumn{2}{c}{**Sum of Squares**} & \multirow{2}{*}{**df**} & \multicolumn{2}{c}{**Mean**} & \multirow{2}{*}{\(F\)} & \multirow{2}{*}{\(p\)} \\  & & & & & & \\  & & **Type** & & & & \\ \hline \multirow{8}{*}{Sample} & \multirow{2}{*}{4R} & Between & 0.319 & 3 & 0.106 & 0.052 & 0.985 \\  & & Within & 321.775 & 156 & 2.063 & & \\  & & Total & 322.094 & 159 & & & \\ \hline \multirow{8}{*}{Sample} & \multirow{2}{*}{6R} & Between & 2.150 & 3 & 0.717 & 0.455 & 0.714 \\  & & Within & 245.450 & 156 & 1.573 & & \\  & & Total & 247.600 & 159 & & & \\ \hline \multirow{8}{*}{10R} & \multirow{2}{*}{(a)} & Between & 2.469 & 3 & 0.823 & 0.481 & 0.696 \\  & & Within & 267.125 & 156 & 1.712 & & \\  & & Total & 269.594 & 159 & & & \\ \hline \multirow{8}{*}{Pattern} & \multirow{2}{*}{(b)} & Between & 23.119 & 3 & 7.706 & 4.269 & 0.006 \\  & & Within & 281.575 & 156 & 1.805 & & \\ \cline{1-1}  & & Total & 304.694 & 159 & & & \\ \hline \multirow{8}{*}{Pattern} & \multirow{2}{*}{(c)} & Between & 2.675 & 3 & 0.892 & 0.456 & 0.713 \\  & & Within & 305.100 & 156 & 1.956 & & \\ \cline{1-1}  & & Total & 307.775 & 159 & & & \\ \hline \multirow{8}{*}{Pattern} & \multirow{2}{*}{(b)} & Between & 5.319 & 3 & 1.773 & 1.306 & 0.275 \\  & & Within & 211.775 & 156 & 1.358 & & \\ \cline{1-1}  & & Total & 217.094 & 159 & & & \\ \hline \multirow{8}{*}{Pattern} & \multirow{2}{*}{(c)} & Between & 8.719 & 3 & 2.906 & 1.670 & 0.176 \\ \cline{1-1}  & & Within & 271.525 & 156 & 1.741 & & \\ \cline{1-1}  & & Total & 280.244 & 159 & & & \\ \hline \multirow{8}{*}{(d)} & \multirow{2}{*}{Between} & 11.719 & 3 & 3.906 & 1.861 & 0.139 \\ \cline{1-1}  & & Within & 327.525 & 156 & 2.100 & & \\ \cline{1-1}  & & Total & 339.244 & 159 & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 6: Results of one-way ANOVA for grip comfort by each sample and usage pattern. \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multirow{2}{*}{**Source**} & \multicolumn{2}{c}{**Sum of Squares**} & \multirow{2}{*}{**df**} & \multicolumn{2}{c}{**Mean**} & \multirow{2}{*}{\(F\)} & \multirow{2}{*}{\(p\)} \\  & & **Type III** & & & & \\ \hline Sample & 45.867 & 3 & 15.289 & 7.590 & 0.000 & 0.163 \\ Error (Sample) & 235.695 & 117 & 2.014 & & & \\ Pattern & 3.467 & 3 & 1.156 & 0.426 & 0.734 & 0.011 \\ Error (Pattern) & 317.095 & 117 & 2.710 & & & \\ Sample \(\times\)Pattern & 42.239 & 9 & 4.693 & 4.526 & 0.000 & 0.104 \\ Error (Sample \(\times\)Pattern) & 363.948 & 351 & 1.037 & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 7: Results of four-way mixed ANOVA for grip comfort (Test result of within subject effects). In usage patterns, usage pattern (b) and (c) showed a significant difference in control comfort among the samples. Post hoc analysis showed two homogeneous subsets for each pattern. First, in pattern (b), the first subset was composed of the samples with a curvature of 6R, 8R and 10R, while the samples with a curvature of 4R and 6R constituted the second subset. Second, in pattern (c), the first subset was composed of the samples with a curvature of 8R and 10R, while the samples with a curvature of 4R and 6R constituted the second subset.