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Table 4 Discriminative validity: Comparison of the Pittsburgh Sleep Quality Index (PSQI) scores between normal sleepers and insomniacs as determined by clinical interview in community dwelling Ethiopian adults

From: Validation of the Pittsburgh sleep quality index in community dwelling Ethiopian adults

Components of the PSQI Mean rank p-value
Normal sleepers Primary Insomniacs
PSQI component of sleep quality 90.88 189.19 <0.01
PSQI component of sleep latency 94.47 187.36 <0.01
PSQI component of sleep duration 131.25 168.61 <0.01
PSQI component of sleep efficiency 131.11 168.68 <0.01
PSQI component of sleep disturbances 130.65 168.92 <0.01
PSQI component of sleep medication 155.00 156.51 0.52
PSQI component of daytime dysfunction 154.40 156.82 0.58
Global PSQI scorea 4.70 ± 3.46 8.11 ± 2.61 <0.01
  1. aMean ± SD, Independent t-test was used for the global PSQI score and Mann Whitney U test was applied for component scores