Figure 2.

Predicted circadian function for olfactory sensitivity. Sample average circadian function with 95% confidence interval estimated using multilevel cosinor model. Twenty-four-hour clock time was pegged to the average initial dim light melatonin onset phase (20:59). Shaded bands represent biological night. Mesor, mid-value of a circadian cycle; Acrophase, phase of circadian peak; Amplitude, height of the circadian cycle (distance from Mesor to Acrophase). Higher amplitude indicates greater olfactory sensitivity.