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Table 6 Means and standard deviations for annual mean cortisol concentration at the six time points during the day

From: Annual variation in daily light exposure and circadian change of melatonin and cortisol concentrations at a northern latitude with large seasonal differences in photoperiod length

   Time of the day
(hh:mm)
   11:00 15:00 19:00 23:00 3:00 7:00
Cortisol concentration Mean (pg/ml) 0.19 0.19 0.11 0.20 0.16 0.50
N = 15 SD (pg/ml) 0.20 0.28 0.13 0.45 0.13 0.31