The amount of current passing through the human body.
The duration of current passing through the human body.
The path of current through human body, brain and heart is the most harmful.
The frequency of current, AC current is more harmful than DC current, and the frequency of 50~60 Hz in AC current is more harmful than high frequency current.
People's own individual factors (such as age, gender, physique, etc. ).
Update 1: If the answer is correct.
I am better than the best solution! If the answer is correct.