"Seventy- three patients requesting sex reassignment surgery (SRS) were recruited for this crosssectional study. Of the participants, 57.5% were biologically male and 42.5% were biologically female.... The frequency of personality disorders was 81.4%. The most frequent personality disorder was narcissistic personality disorder (57.1%) and the least was borderline personality disorder. The average number of diagnoses was 3.00 per patient."
An interesting study, even if a little old (2014).