Sleep Quality, Dietary Patterns, and Nutrition Knowledge in Ultramarathon Runners and American Football Players: A Comparative Cross-Sectional Study.

Crucially, variables related to nutrition, including DQI and DK, failed to reach statistical significance in the integrated model (all p > 0.05), demonstrating a lack of independent influence on sleep quality in this cohort.

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The athletic discipline emerged as a highly significant predictor, where belonging to the UM group was associated with a PSQI score reduction of 2.498 points, indicating substantially better sleep quality independent of other variables ( p = 0.001; 95% CI: 3.976 to −1.021).

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