A Study of Diurnal Cortisol Adaptations in Sleep-Deprived Firefighters During a 72-Hour Work Shift: A Case Series.

Cureus · 2023 · PMC10101191 · PMID 37064725

Europe PMC DOI

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moderately significantno p-value reported

A moderately significant percentage (40%) of the downward trend in morning cortisol could be explained by the diurnal variation (R 2 =0.40) whereas an extremely large, highly significant percentage (98%), virtually all this man’s evening cortisol, is explained by his diurnal variation (R 2 =0.98).

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