Average deviation of the five factor personality profile of heroin users from the population mean.E. Fehrman, A. K. Muhammad, E. M. Mirkes, V. Egan, A. N. Gorban,The Five Factor Model of personality and evaluation of drug consumption risk, arXiv:1506.06297 , 2015 N stands for Neuroticism, E for Extraversion, O for Openness to experience, A for Agreeableness and C for Conscientiousness.