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Table 5 Means and standard deviations for peak level of melatonin across the seasons as derived from the SPLINE analysis

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

   Season
   Winter Spring Summer Autumn
Peak level of melatonin Mean (pg/ml) 9.44 6.48 5.97 6.13
N = 15 SD (pg/ml) 4.82 3.60 3.22 3.19