Table 2.
Time | Cortisol (nmol/l) | Cortisol (natural log) | |||||
---|---|---|---|---|---|---|---|
Occasion | M | SD | M | SD | Median | M | SD |
Wake | 6.43 a.m. | 83 min | 21.50 | 10.88 | 19.48 | 2.93 | 0.57 |
30 minutes after wake | 7.16 a.m. | 83 min | 29.59 | 11.94 | 28.78 | 3.29 | 0.50 |
Bedtime | 11.05 p.m. | 73 min | 4.80 | 5.22 | 3.21 | 1.24 | 0.75 |
Notes. Participant N = 197; Day N = 662.
Participants provided a total of 759 days of useable cortisol data. We removed a total of 97 days of data due to the following: Days without a completed daily interview (n = 1), days with values over 60 nmol/l (n = 50), days with missing time (n = 16), days in which participant was awake less than 12 hours or more than 20 hours (n = 16), and days in which the 30 minute cortisol sample was taken less than 15 minutes after wake or more than 60 minutes after wake (n = 18).