Shift Work Disorder Index: initial validation and psychosocial associations in a sample of nurses

Fourteen percent of shift-working nurses may have probable shift work sleep disorder, as indicated by the Shift Work Disorder Index.

• The Shift Work Disorder Index demonstrated excellent internal consistency with a reliability score of α = .94.
• Thirty-one percent of the nurse sample reported being past-month shift workers.
• Among shift workers, 44% were identified as having probable shift work sleep disorder based on the index.
• Nurses with shift work or probable shift work sleep disorder reported greater evening preference and more sleep-related issues.
• Shift work and probable shift work sleep disorder were linked to increased symptoms of depression, anxiety, and stress.
• Actigraphy and sleep diaries indicated that affected nurses had shorter sleep duration and lower sleep efficiency.

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