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Table 4 Internal consistency and reliability of the ISI scale (n = 120)

From: The Moroccan dialect version of the Insomnia Severity Index

  Cronbach’s alpha for total scale with item removed Reliability ICC (95% CI)
Item 1 0.80 0.90 (0.85–0.93)
Item 2 0.81 0.86 (0.81–0.91)
Item 3 0.84 0.92 (0.89–0.95)
Item 4 0.75 0.92 (0.88–0.94)
Item 5 0.77 0.93 (0.90–0.95)
Item 6 0.75 0.93 (0.90–0.95)
Item 7 0.77 0.90 (0.86–0.93)
Total score 0.81 0.99 (0.99–1.00)
  1. ICC intra-class correlation coefficient
  2. Kappa = 0.76