Men and women are diagnosed in equal numbers with<unk>  disorder. A 1991 study on a sample from Winnipeg, Manitoba estimated the prevalence of<unk>  disorder at 2.4% of the population. A 2008 review of several studies estimated the prevalence between 0.8% and 1.9%. This disorder is episodic in about one-third of individuals, with each episode lasting from hours to months at a time.<unk>  can begin episodically, and later become continuous at constant or varying intensity. Onset is typically during the teenage years or early 20s, although some report being depersonalized as long as they can remember, and others report a later onset. The onset can be acute or insidious. With acute onset, some individuals remember the exact time and place of their first experience of<unk> . This may follow a prolonged period of severe stress, a traumatic event, an episode of another mental illness, or drug use. Insidious onset may reach back as far as can be remembered, or it may begin with smaller episodes of lesser severity that become gradually stronger. Patients with drug-induced<unk>  do not appear to be a clinically separate group from those with a non-drug precipitant. Relation to other psychiatric disorders<unk>  exists as both a primary and secondary phenomenon, although making a clinical distinction appears easy, it is not absolute. The most common comorbid disorders are depression and anxiety, although cases of<unk>  disorder without symptoms of either do exist. Comorbid obsessive and compulsive behaviours may exist as attempts to deal with<unk> , such as checking whether symptoms have changed and avoiding behavioural and cognitive factors that exacerbate symptoms. Many people with personality disorders such as schizoid personality disorder, schizotypal personality disorder, and borderline personality disorder will have high chances of having<unk>  disorder.
Depersonalization-derealization disorder
Transference neurosis
Psychopathy
Dissociative identity disorder
Dissociative disorder
Gemütlose psychopathy
Other specified dissociative disorder
Unitary psychosis