Validation of the French version of the Insomnia Severity Index in a population with psychiatric disorders and sleep complaints.

Insomnia disorder is a major health concern, particularly among patients with mood disorders. This study validates the translated version of the Insomnia Severity Index (ISI) in a French population with psychiatric disorders, particularly mood disorders. The ISI was completed by 260 patients with sleep complaints comorbid with psychiatric disorders, including 209 patients with mood disorders. The majority of participants were women (n=168), and the most diagnosed condition in the population was unipolar mood disorder (n=170). Internal and external validity analyses validated the scale's reliability and its validity in relation to sleep quality and a diagnosis of insomnia made by a sleep psychiatrist. These results support the use of the French translation of the ISI in a French population with psychiatric disorders.