Summary score for the Insomnia Severity Index. (Morin CM, Insomnia, psychological assessment and management. Guilford Press, New York, 1993)[https://pubmed.ncbi.nlm.nih.gov/21532953/] Each item is scored from 0 to 4. Total score is the sum of all seven items (0 to 28), and catergorized as: not clinically significant (0-7), sub-threshold insomnia (8-14), moderate insomnia (15-21), and severe insomnia (22-28).

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