Table 1.

Results of the measurements of the root mean square error (RMSE) values of trueness and precision

Group	Trueness (Mean ± SD) (mm)	Precision (Mean ± SD) (mm)
1	0.076 ± 0.010	0.019 ± 0.009
2	0.080 ± 0.009	0.021 ± 0.007
3	0.107 ± 0.011	0.028 ± 0.011
4	0.046 ± 0.009	0.022 ± 0.009
5	0.072 ± 0.007	0.017 ± 0.007
6	0.079 ± 0.008	0.018 ± 0.008
7	0.124 ± 0.016	0.027 ± 0.011

SD, standard deviation