## 3 Results  
### Descriptive Statistics of PDATL Questionnaire  
Descriptive statistics of the two data sets for the nine-item PDATL, including the mean, standard deviation (SD), and variance (Var), are presented in Table 2. The distribution of the participants' responses within the Likert scale was comparable in both data sets, as more than 50% of the participants presented rare or no functional disturbance (Table 3). In the study1-NKUA, the participants showed a higher percentage range of rare or no functional problems (between 56% and 67%). Moreover, as expected, the denture wearers of Study-2-AUTH presented a lower percentage range of rare or no disturbance (between 50% and 57%) in items of functional health. Notably, all participants provided complete answers to all questions, except that no participants from both studies used the response \"don't know\" in any of the questions. The remaining percentage of complete denture wearers who presented with functional disturbances was still substantial, potentially attributed to the quality of the complete dentures or anatomical conditions that contributed to the observed functional disorders.  
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline  & \multicolumn{3}{c}{**Study 1-NKUA**} & \multicolumn{3}{c}{**Study 2-AUTH**} \\ \hline Participants & \multicolumn{3}{c}{Gender} \\ \hline Age & Female & Male & Total & Female & Male & Total \\ \hline Older (65+) & 28 (45\%) & 54 (56\%) & 82 (52\%) & 34 (77\%) & 42 (69\%) & 76 (72\%) \\ \hline Younger (\(\leq\)64) & 34 (55\%) & 43 (44\%) & 77 (48\%) & 10 (23\%) & 19 (31\%) & 29 (28\%) \\ \hline Total & 62 (100\%) & 98 (100\%) & 160 (100\%) & 44 (100\%) & 61 (100\%) & 105 (100\%) \\ \hline \hline \end{tabular}
\end{table}
Table 1: Participants’ profiles in gender and age distribution of both settings.  
\begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline
**Domains** & \multicolumn{3}{c}{**Items (I)**} & \multicolumn{3}{c}{**Study 1-NKUA**} & \multicolumn{3}{c}{**Study 2-AUTH**} \\ \hline  & & & **Mean** & **SD** & **Var** & **Mean** & **SD** & **Var** \\ \hline \multirow{4}{*}{Functional Health} & II & Trouble speaking & 3.98 & 1.18 & 1.40 & 3.50 & 1.08 & 1.16 \\ \cline{2-9}  & I2 & Trouble eating & 3.64 & 1.24 & 1.54 & 3.45 & 1.19 & 1.40 \\ \cline{2-9}  & I3 & Change diet & 3.61 & 1.23 & 1.51 & 3.60 & 1.17 & 1.36 \\ \cline{2-9}  & I4 & Discomfort/pain & 3.94 & 1.28 & 1.63 & 3.85 & 0.85 & 0.73 \\ \hline \multirow{4}{*}{Body Image} & I5 &
\begin{tabular}{c} Uncomfortable/impact on \\ the appearance \\ \end{tabular} & 2.79 & 1.44 & 2.08 & 3.51 & 1.09 & 1.20 \\ \cline{2-9}  & I6 & Think a lot about tooth loss & 2.68 & 1.41 & 1.99 & 3.61 & 1.14 & 1.30 \\ \cline{2-9}  & I7 & Avoid social situations & 4.29 & 1.14 & 1.30 & 4.09 & 0.98 & 0.96 \\ \cline{2-9}  & I8 & Stress in relationship/marriage & 4.24 & 1.14 & 1.29 & 4.50 & 0.90 & 0.81 \\ \cline{2-9}  & I9 & Difficult to relax & 4.46 & 1.02 & 1.04 & 3.74 & 1.01 & 1.02 \\ \hline \hline \end{tabular}
\end{table}
Table 2: Descriptive statistics of the PDATL-1 questionnaire in both data sets.  
\begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline  & & **II** & **I2** & **I3** & **I4** & **I5** & **I6** & **I7** & **I8** & **I9** \\ \hline \multirow{3}{*}{very often} & Study 1-NKUA & 8 (5\%) & 14 (9\%) & 12 (8\%) & 12 (7\%) & 44 (27\%) & 48 (30\%) & 8 (5\%) & 7 (4\%) & 7 (4\%) \\ \cline{2-9}  & Study 2-AUTH & 5 (5\%) & 9 (9\%) & 7 (7\%) & 1 (1\%) & 8 (8\%) & 5 (5\%) & 3 (3\%) & 3 (3\%) & 4 (4\%) \\ \hline \hline \end{tabular}
\end{table}
Table 3: The distribution of the answers within the Likert scale for both data sets.