# Optimization of Image Capture Distance for Facial Thermograms in Dentistry
## 3 Results
### Correlations of the Mean Overall Temperature

Table 4: Analysis of the mean overall temperature and the mean temperature at the region of interest (ROI) at different shooting distances. \begin{table}
\begin{tabular}{l c c c c c} \hline \hline \multicolumn{1}{c}{Front} & \multicolumn{1}{c}{} & & & \\ \hline Mean overall temp. & Test Statistic & Std. Error & Std. Test Statistic & Sig. & \(p\)-value \\ \hline  & 50 cm–30 cm & 152.38 & 15.02 & 10.15 & \(<\)0.001 & \(<\)0.001 \\ \hline  & 50 cm–15 cm & 287.91 & 15.02 & 19.17 & \(<\)0.001 & \(<\ \begin{table}
\begin{tabular}{c c c c c c} \hline
**Parameters** & \multicolumn{4}{c}{**Mean Overall Temp.**} & \multicolumn{2}{c}{**Mean ROI**} \\ \hline Demographic factors & \(n\) & CC & \(p\)-value & CC & \(p\)-value \\ \hline Sex & 1350.00 & \(-\)0.033 & 0.223 & \(-\)0.040 & 0.146 \\ \hline Age & 1350.00 & 0.031 & 0.249 & 0.009 & 0.744 \\ \hline Room temperature & 1350.00 & \(-\)0.014 & 0.603 & \(-\)0.150 ** & \(<\)0.001 \\ \hline Relative humidity & 1350.00 & \(-\)0.012 & 0.670 & \(-\)0.058 * & 0.033 \\ \hline Personal effects & & & & & \\ \hline Jewelry & 1350.00 & \(-\)0.042 & 0.127 & \(-\)0.001 & 0.979 \\ \hline Facial cosmetics present & 1350.00 & 0.042 & 0.126 & 0.206 ** & \(<\)0.001 \\ \hline Spectacles * & 1350.00 & 0.070 * & 0.011 & 0.136 ** & \(<\)0.001 \\ \hline Tight clothes * & 1350.00 & \(-\)0.001 & 0.971 & \(-\)0.013 & 0.639 \\ \hline Pressure stockings * & 1350.00 & 0.006 & 0.839 & 0.023 & 0.406 \\ \hline Scarf over head, neck, and mouth * & 1350.00 & \(-\)0.043 & 0.118 & 0.022 & 0.424 \\ \hline Use of scarf/headphones/cap/hat/shavl *** & 1350.00 & \(-\)0.084 ** & 0.002 & \(-\)0.163 ** & \(<\)0.001 \\ \hline Object around the neck *** & 1350.00 & \(-\)0.099 ** & \(<\)0.001 & \(-\)0.243 ** & \(<\)0.001 \\ \hline Mask *** & 1350.00 & - & - & - & - \\ \hline Medications & & & & & \\ \hline Sympathetic blockers ** & 1350.00 & 0.010 & 0.711 & \(-\)0.058 * & 0.034 \\ \hline Neurological Blockers ** & 1350.00 & \(\cdot\) & \(\cdot\) & \(\cdot\) & \(\cdot\) \\ \hline Steroids ** & 1350.00 & \(-\)0.031 & 0.259 & \(-\)0.123 ** & \(<\)0.001 \\ \hline Vasoactive drugs ** & 1350.00 & 0.010 & 0.711 & \(-\)0.058 * & 0.034 \\ \hline Treatments & & & & & \\ \hline Dental treatments ** & 1350.00 & 0.079 ** & 0.004 & 0.160 ** & \(<\)0.001 \\ \hline Physiotherapy ** & 1350.00 & \(-\)0.071 ** & 0.009 & \(-\)0.179 ** & \(<\)0.001 \\ \hline Oral care & & & & & \\ \hline Tooth brushing * & 1350.00 & \(-\)0.041 & 0.134 & \(-\)0.183 ** & \(<\)0.001 \\ \hline Inter-dental cleaning * & 1350.00 & 0.095 ** & \(<\)0.001 & 0.214 ** & \(<\)0.001 \\ \hline Mouthwash use * & 1350.00 & 0.077 ** & 0.005 & 0.228 ** & \(<\)0.001 \\ \hline Food \& beverages & & & & \\ \hline Bonbons * & 1350.00 & \(-\)0.018 & 0.519 & 0.090 ** & \(<\)0.001 \\ \hline Eating * & 1350.00 & 0.011 & 0.685 & 0.056 * & 0.040 \\ \hline Drinking * & 1350.00 & 0.002 & 0.956 & 0.056 * & 0.041 \\ \hline Coffee * & 1350.00 & 0.039 & 0.147 & \(-\)0.119 ** & \(<\)0.001 \\ \hline Smoking * & 1350.00 & \(-\)0.022 & 0.411 & \(-\)0.219 ** & \(<\)0.001 \\ \hline Energy drinks ** & 1350.00 & 0.043 & 0.113 & 0.132 ** & \(<\)0.001 \\ \hline Eating *** & 1350.00 & 0.021 & 0.436 & 0.025 & 0.352 \\ \hline Drinking *** & 1350.00 & 0.008 & 0.783 & \(-\)0.005 & 0.845 \\ \hline Miscellaneous & & & & & \\ \hline Hot-water use * & 1350.00 & 0.043 & 0.115 & \(-\)0.098 ** & \(<\)0.001 \\ \hline Sauna ** & 1350.00 & \(-\)0.036 & 0.181 & \(-\)0.009 & 0.749 \\ \hline Shower *** & 1350.00 & 0.040 & 0.138 & 0.034 & 0.209 \\ \hline Shaving *** & 1350.00 & \(-\)0.034 & 0.208 & \(-\)0.076 ** & 0.005 \\ \hline Hairdryer use * & 1350.00 & 0.082 ** & 0.003 & 0.132 ** & \(<\)0.001 \\ \hline \end{tabular} \(n\)—number; CC—correlation constant; significance—\(p<\) 0.05 (\(p\)-value: Spearman’s Rho); * 4 h; **24 h; ** last 1 h, *** Same day.  
\end{table} 
Table 6: Correlation of the measured mean overall temperature and the mean temperature at the region of interest (ROI) with the various parameters.