## 3 Results
### CPR Performance with No-Feedback and with Real-Time Feedback System
#### 3.1.2 Chest Release Force  
The medical participants performed infant CPR using the TT compression technique, see Figure 5b. The mean value of the achieved chest release force with no feedback on performance was 3.58 \(\pm\) 0.70 kg compared to the chest release force parameter mean value of 2.15 \(\pm\) 0.42 kg with feedback. The median value of the chest release force parameter with no feedback and feedback were 3.6 kg and 2.2 kg, respectively. The difference and percentage of difference between the no feedback and feedback group were 1.4% and 39%. During CPR, there was an improvement in the chest release force parameter with feedback approximately 40% compared to the CPR performance without feedback. There was a significant difference in the chest release force parameter during feedback-assisted performance compared to unassisted performance (\(p<\) 0.05).  
In addition, the medical participants performed infant CPR using the TF compression technique, see Figure 5b. The mean value of the achieved chest release force during no feedback was 3.35 \(\pm\) 0.40 kg compared to the chest release force parameter mean value of 2.11 \(\pm\) 0.38 kg with feedback. During CPR, there was an improvement in the chest release force parameter with feedback of approximately 37% compared to the CPR performance without feedback. The median value of the chest release force parameter with no feedback and feedback on performances were 3.5 kg and 2.1 kg, respectively. The difference and percentage of difference between the no feedback and feedback group were 1.4% and 40% consequently. There was a significant difference in the chest release force parameter with feedback-assisted performance compared to unassisted performance (\(p<\) 0.05).  
The lay participants performed infant CPR using the TT compression technique, see Figure 5b. The mean value of the achieved chest release force using the TT compression mechanism with no performance feedback was 3.88 \(\pm\) 0.91 kg compared to the chest release force parameter mean value 2.44 \(\pm\) 0.60 kg with feedback. During CPR, there was an improvement in the chest release force parameter with feedback of approximately 37% compared to the CPR performance without feedback. The median value of the chest release force parameter during no feedback and feedback performance were 3.8 kg and 2.4 kg, respectively. The difference and percentage of difference between the no feedback and feedback group were 1.4% and 37%. There was a significant difference in the chest release force parameter with feedback-assisted performance compared to unassisted performance (\(p<0.05\)).  
In addition, when lay participants performed infant CPR using the TF compression technique, see Figure 5b. The mean value of the achieved chest release force during no performance feedback was 3.55 \(\pm\) 0.67 kg compared to the chest release force parameter mean value of 2.14 \(\pm\) 0.72 kg during feedback performance. During CPR, there was an improvement in the chest release force parameter with the feedback of approximately 40% compared to the CPR performance without feedback. The median value of the chest release force parameter during no feedback and feedback performance were 3.6 kg and 2.1 kg, respectively. The difference and percentage of difference between the no feedback and feedback group were 1.5% and 42%. There was a significant difference in the chest release force parameter with feedback-assisted performance compared to unassisted performance (\(p<0.05\)).