Abstract
What is the lifetime risk of experiencing mental health disorder? Although knowledge about lifetime incidence is vital for health care policies, etiological theories, and public perceptions of mental health disorder, lifetime incidence estimates remain controversial.1 One source of information is hospital data. A nationwide study estimated that approximately one-third of the Danish population received hospital treatment (either inpatient or outpatient) for a mental health disorder in their lifetime.2 But since most people experiencing mental health problems do not require secondary care treatment, this is an underestimate of lifetime risk of mental health disorder.

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