Table 2:

PEP analysis of comparisons for different study groups under different study stages. PEP intervals were computed using both CEA and TEA. The statistically significant difference between the PEP means of these groups under different study stages was evaluated. Also, AUC of ROC curves for classification between distinct groups based on PEP values were calculated.

Study stage	Study group
Baseline vs Speech task	PTSD participants Non-PTSD participants
Difference between Speech and Baseline task	PTSD vs non-PTSD participants
Arithmetic task (Active tcVNS vs Sham tcVNS)	PTSD participants Non-PTSD participants