Statistical analysis
We used the software programs Object-Relational DBMS and Google spreadsheet with SPSS. The Mann–Whitney U test, one-way repeated-measures ANOVA calculator, and post hoc Tukey honestly significant difference (HSD) test were applied. A significant T test was performed among the T1: DDS(+)/VRD(+), T2: DDS(−)/VRD(+), T3: DDS(+)/VRD(−), and T4: DDS(−)/VRD(−) groups.
