As Table 3 shows, personality clusters A and B showed
significant differences. Cluster A dimension scores were
significantly higher in the other psychoses group (19.4% vs.
14.7%) and cluster B scores were higher in the group with
amphetamine psychosis (38.2% vs. 8.3%). In particular, the
Schizoid personality disorder and Schizotypal personality
disorder were significantly more frequent among the other
psychoses group and antisocial personality disorder and
borderline personality disorder were more frequent in the
amphetamine psychosis group. No significant difference
among the amphetamine psychosis group and the other
psychoses group regarding paranoid, histrionic, narcissistic
and cluster C personality disorders. Overall, personality
disorders were significantly higher among the amphetamine
psychosis group (73.5%) than the other psychoses group
(44.4%) with p value