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Table 1 Summary of demographic data, sleep and physiological variables for early (ECT) and late (LCT) chronotypes

From: The effects of time of day and chronotype on cognitive and physical performance in healthy volunteers

Variable measured (mean ± SEM) ECTs LCTs Significance
Sample size N = 25 N = 31 n/a
Number of testing sessions N = 75 N = 93 n/a
Number of males/females M = 9 M = 14 p = 0.59 (ns)b
F = 16 F = 17
Age (years) (mean ± SD) 22.8 ± 4.5 20.8 ± 3.0 p = 0.084 (ns)a
Height (cm) 172.5 ± 1.7 172.5 ± 1.9 p = 0.99 (ns)a
Weight (kg) 67.7 ± 2.3 69.8 ± 2.0 p = 0.55 (ns)a
MSFsc (hh:mm) 02:38 ± 00:07 06:59 ± 00:12 p < 0.0001a
Sleep onset (hh:mm) 23:03 ± 00:07 02:36 ± 00:14 p < 0.0001a
Wake-up time (hh:mm) 06:45 ± 00:08 10:30 ± 00:14 p < 0.0001a
Sleep duration (h) 7.69 ± 0.14 7.85 ± 0.14 p = 0.55 (ns)a
Dim light melatonin onset (hh:mm) 20:27 ± 00:16 23:55 ± 00:26 p < 0.0001a
Cortisol peak time (hh:mm) 07:04 ± 00:16 11:13 ± 00:23 p < 0.0001a
  1. Values are shown as mean ± SEM unless specified. The significance is shown with aunpaired two-sample t tests, bFisher’s exact test. MSFsc = corrected mid-sleep time of free days. All p values are corrected for the false discovery rate