SPD is uncommon in clinical settings (about 2.2%) and occurs more commonly in males. It is rare compared with other personality disorders, with a prevalence estimated at less than 1% of the general population. Philip Manfield suggests that the<unk>  condition", which roughly includes the DSM<unk> , avoidant and schizotypal personality disorders, is represented by "as many as forty percent of all personality disorders." Manfield adds "This huge discrepancy from the ten percent reported by therapists for the condition is probably largely because someone with a<unk>  disorder is less likely to seek treatment than someone with other axis-II disorders." A 2008 study assessing personality and mood disorder prevalence among homeless people at New York City drop-in centres reported an SPD rate of 65% among this sample. The study did not assess homeless people who did not show up at drop-in centres, and the rates of most other personality and mood disorders within the drop-in centres was lower than that of SPD. The authors noted the limitations of the study, including the higher male-to-female ratio in the sample and the absence of subjects outside the support system or receiving other support (e.g., shelters) as well as the absence of subjects in geographical settings outside New York City, a large city often considered a magnet for disenfranchised people. A University of Colorado Colorado Springs study comparing personality disorders and Myers–Briggs Type Indicator types found that the disorder had a significant correlation with the Introverted (I) and Thinking (T) preferences.
Schizoid personality disorder
Avoidant personality disorder
Histrionic personality disorder
Organic personality disorder
Haltlose personality disorder
Dependent personality disorder
Depressive personality disorder
Obsessive–compulsive personality disorder