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. 2017 Jul 24;12(7):e0181978. doi: 10.1371/journal.pone.0181978

Fig 4. Cortisol.

Fig 4

Moring cortisol levels were significantly lower after sleep deprivation (mean = 0.35, SD = 0.22) relative to the morning of baseline testing (mean = 0.63, SD = 0.24), t(18) = 6.61, p < 0.01.