Structure and reliability of the Persian versions of children's daytime sleepiness and morning-evening preference questionnaires

A sample of 407 Iranian adolescents demonstrated acceptable to good model fit for the Persian versions of the Pediatric Daytime Sleepiness Scale and the Morningness-Eveningness Scale.

• The one factor solution of the Pediatric Daytime Sleepiness Scale and the two factor solution of the Morningness-Eveningness Scale showed good validity and reliability.
• A strong correlation was observed between raw and latent factor scores for both scales.
• Increased scores on the Pediatric Daytime Sleepiness Scale, indicating more daytime sleepiness, were associated with lower scores on the Morningness-Eveningness Scale, reflecting more evening orientation.
• Findings support the criterion validity of both scales in measuring sleep patterns among adolescents.

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