Table 2 The distance of the COM between IGTVs (cm)

$\overline{\mathit{x}}\pm \mathrm{s}$

0.66 ± 0.31

0.42 ± 0.36

0.32 ± 0.17

95% CI

0.49 ~ 0.83

0.22 ~ 0.61

0.23 ~ 0.42