# Comparing the Diagnostic Accuracy of CBCT
## 3 Results
### Test Results
\begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline \multirow{2}{*}{**Group**} & \multirow{2}{*}{**Correlated Pairs**} & \multicolumn{6}{c}{**Paired Differences**} & \multirow{2}{*}{**t**} & \multirow{2}{*}{**df**} & \multicolumn{2}{c}{**\(P\) Value**} \\ \cline{3-3} \cline{5-10}  & & & & & **05\% CI of Difference** & & & **(Sig.2-tailed)** \\ \hline \multirow{4}{*}{1} & GS Ant Man—T value & 523.0 & 76.4 & 11.8 & 499.2 & 546.8 & 44.363 & 41 & **0.000*** \\ \cline{2-10}  & GS Post Man—T value & 344.1 & 37.8 & 5.8 & 332.3 & 355.9 & 59.061 & 41 & **0.000*** \\ \cline{2-10}  & GS Ant Max –T value & 375.0 & 36.9 & 5.7 & 363.5 & 386.5 & 65.912 & 41 & **0.000*** \\ \cline{2-10}  & GS Post Max—T value & 136.4 & 61.6 & 9.5 & 117.3 & 155.6 & 14.363 & 41 & **0.000*** \\ \hline \multirow{4}{*}{2} & GS Ant Man—T value & 523.0 & 76.4 & 11.8 & 499.2 & 546.8 & 44.363 & 41 & **0.000*** \\ \cline{2-10}  & GS Post Man—T value & 739.6 & 178.0 & 28.5 & 681.9 & 797.3 & 25.955 & 38 & **0.000*** \\ \cline{2-10}  & GS Ant Max—T value & 753.4 & 186.3 & 29.8 & 693.0 & 813.8 & 25.256 & 38 & **0.000*** \\ \cline{2-10}  & GS Post Max—T Value & 547.8 & 109.9 & 17.6 & 512.2 & 583.4 & 31.124 & 38 & **0.000*** \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Paired sample _t_-test for associations between T value and GS values at different jaw regions within each group. \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multicolumn{2}{c}{**Variable**} & \multicolumn{1}{c}{**Sum of Squares**} & \multicolumn{1}{c}{**df**} & \multicolumn{1}{c}{**Mean Square**} & \multicolumn{1}{c}{**F**} & \multicolumn{1}{c}{**Sig. (P Value)**} \\ \hline \multirow{4}{*}{GS Ant Man} & Between Groups & 2,885,793.146 & 1 & 2,885,793.146 & 223.628 & **0.000*** \\ \cline{2-6}  & Within Groups & 1,019,448.286 & 79 & 12,904.409 & & \\ \cline{2-6}  & Total & 3,905,241.432 & 80 & & & \\ \hline \multirow{4}{*}{GS Post Man} & Between Groups & 3,217,329.443 & 1 & 3,217,329.443 & 199.911 & **0.000*** \\ \cline{2-6}  & Within Groups & 1,271,408.359 & 79 & 16,093.777 & & \\ \cline{2-6}  & Total & 4,488,737.802 & 80 & & & \\ \hline \multirow{4}{*}{GS Ant Max} & Between Groups & 2,947,173.626 & 1 & 2,947,173.626 & 168.274 & **0.000*** \\ \cline{2-6}  & Within Groups & 1,383,618.374 & 79 & 17,514.157 & & \\ \cline{2-6}  & Total & 4,330,792.000 & 80 & & & \\ \hline \multirow{4}{*}{GS Post Max} & Between Groups & 3,477,609.692 & 1 & 3,477,609.692 & 442.843 & **0.000*** \\ \cline{2-6}  & Within Groups & 620,380.308 & 79 & 7852.915 & & \\ \cline{2-6}  & Total & 4,097,990.000 & 80 & & & \\ \hline \multirow{4}{*}{T value} & Between Groups & 226.051 & 1 & 226.051 & 535.890 & **0.000*** \\ \cline{2-6}  & Within Groups & 33.324 & 79 & 0.422 & & \\ \cline{2-6}  & Total & 259.376 & 80 & & & \\ \hline \hline \end{tabular}
\begin{tabular}{c} GS —Grayscale values; Ant = Anterior; Post = Posterior; Man = Mandible; Max = Maxilla; df = Degree of Freedom; F = F statistics; Sig. = Significance. *** \(P<0.001\). \\ \hline \hline GS: Grayscale values; Ant = Anterior; Post = Posterior; Max = Maxilla; Man = Mandible; t = t-statistics. R square = 0.849. Excluded variables from the model were GS values at Ant Max, CS values at Ant Man and GS values at Post Man, *** \(P<0.001\).  
\end{table} 
Table 5: Analysis of variance (ANOVA) of T value and GS values at different jaw regions between groups.