Table 2.

Extraction questions.

EQ #	Extraction questions
EQ1:	What PTSD diagnostic method was used?
EQ2:	What was the data source? What was the sample distribution?
EQ3:	What was the best machine learning model reported?
EQ4:	What was the objective of the study?
EQ5:	What were the main results?
EQ6:	What was the sample size?
EQ7:	What was the ML validation method used?
EQ8:	What were the control group and psychiatric group?
EQ9:	What was the conclusion of the paper?
EQ10:	What was the limitation and future improvement?