# Chest Compression Skill Evaluation System Using Pose Estimation and Web-Based Application
## 6 Discussion  
### Evaluation of Accuracy  
Table 5 shows that the accuracy of IP, CC, and CAT tends to be high, with the overall accuracy exceeding 60% in all environments. For these three items, the accuracy with \begin{table}
\begin{tabular}{l l l l l l l l l} \hline \hline  & \multicolumn{2}{c}{**A**} & \multicolumn{2}{c}{**B**} & \multicolumn{2}{c}{**C**} & \multicolumn{2}{c}{**D**} \\ \cline{2-9}  & **Time** & **Tempo** & **Time** & **Tempo** & **Time** & **Tempo** & **Time** & **Tempo** \\ \hline
1 (Height: 80 Before Training) & 30 s & Best & 30 s & Best & 30 s & Best & 30 s & Best \\ \hline
2 (Height: 80 Before Training) & 30 s & Best & 30 s & Best & 30 s & Best & 30 s & Best \\ \hline
3 (Height: 80 Before Training) & 30 s & Fast Strong & 30 s & Slow Strong & 30 s & Fast Weak & 30 s & Slow Weak \\ \hline
4 (Height: 80 Before Training) & 30 s & Rand & 1 min & Best & Best & Best & 30 s & Best \\ \hline
5 (Height: 50 Before Training) & 30 s & Best & 30 s & Best & 30 s & Best & 30 s & Best \\ \hline
6 (Height: 50 Before Training) & 30 s & Best & 30 s & Best & 30 s & Best & 30 s & Best \\ \hline
7 (Height: 50 Before Training) & 30 s & Fast Strong & 30 s & Slow Strong & 30 s & Fast Weak & 30 s & Slow Weak \\ \hline
8 (Height: 50 Before Training) & 30 s & Best & 30 s & Rand & 1 min & Best & 30 s & Best \\ \hline
9 (Height: 50 After Training) & 30 s & Best & 30 s & Best & 30 s & Best & 30 s & Best \\ \hline
10 (Height: 50 After Training) & 30 s & Best & 30 s & Best & 30 s & Best & 30 s & Best \\ \hline
11 (Height: 50 After Training) & 30 s & Fast Strong & 30 s & Slow Strong & 30 s & Fast Weak & 30 s & Slow Weak \\ \hline
12 (Height: 50 After Training) & 30 s & Best & Rest & Best & 30 s & Rand & 1 min & Best \\ \hline
13 (Height: 80 After Training) & 30 s & Best & 30 s & Best & 30 s & Best & 30 s & Best \\ \hline
14 (Height: 80 After Training) & 30 s & Best & 30 s & Best & 30 s & Best & 30 s & Best \\ \hline
15 (Height: 80 After Training) & 30 s & Fast Strong & 30 s & Slow Strong & 30 s & Fast Weak & 30 s & Slow Weak \\ \hline
16 (Height: 80 After Training) & 1 min & Best & Rest & Best & Best & 30 s & Rand \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Chest compression experiment table. Figure 8: View from above and side in experiment. A: Person who is performed chest compression. (patients); B: Person who perform chest compression. (executer). a camera height of 50 cm was, on average, 1-5% higher than with 80 cm, although the difference was relatively small. Furthermore, CAR also tended to be more accurate with a height of 50 cm, showing accuracy differences of 5-10% even under the same angle conditions (except for CAR at 45\({}^{\circ}\), 80 cm). Interestingly, CAD showed the highest accuracy under the condition of a 30\({}^{\circ}\) angle and 80 cm height. Additionally, an angle of 30\({}^{\circ}\) recorded the maximum accuracy for CC, CAD, CAR, and CAT, indicating that angle had a consistent influence on evaluation accuracy. For additional items such as TAD, TAR, and TAC, the overall accuracy showed relatively small variation with changes in angle or height. Furthermore, higher accuracy in CAR and CAD did not necessarily correspond to higher accuracy in TAD and TAR. Since TAR, TAC, and TAD are considered to better reflect the actual quality of compressions, it is notable that, when examined on a per-compression basis, the system produced results that matched the manikin's reference in over 60% of cases. This suggests that, despite some limitations, the system provides reasonably valid estimations for training and self-assessment purposes. These results suggest that a lower camera height (50 cm) generally improves accuracy for most evaluation items. Moreover, while a 30\({}^{\circ}\) angle appeared optimal in this study, the variation in performance observed at 80 cm depending on the evaluation item implies that the combination of a 30\({}^{\circ}\) angle and 50 cm height could provide even better overall accuracy.