A Wearable System for the Stress Monitoring of Air Traffic Controllers During An Air Traffic Control Refresher Training and the Trier Social Stress Test: A Comparative Study

Fig. (6) Mean statistical differences for ECG-derived measures – a) AVNN; b) RMSSD; c) pNN20 and d) LF/HF (* p<.05; ** p<.01; Mann-Whitney test).