Appendix: The sleep condition indicator

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  • Scoring instructions:

  • Add the item scores to obtain the SCI total (minimum 0, maximum 32).

  • A higher score means better sleep.

  • Scores can be converted to 0–10 format (minimum 0, maximum 10) by dividing total by 3.2.

  • Item scores in grey area represent threshold criteria for Insomnia Disorder.