Table 1. Parameters of the circadian rhythm according to cosinor analysis.
| Controls | Acute insomnia | p | |
|---|---|---|---|
| T | 1437 ± 20 | 1435 ± 22 | 0.733 |
| M | 216 ± 56 | 218 ± 63 | 0.895 |
| A | 178 ± 60 | 178 ± 61 | 0.979 |
| mean(ϕ0) | 232 ± 22 | 253 ± 27 | 0.017 (*) |
| 15 : 28 ± 01 : 28 | 16 : 52 ± 01 : 48 | ||
| R2 | 0.14 ± 0.06 | 0.12 ± 0.05 | 0.446 |
Period T (min), mesor M (1/min), amplitude A (1/min), 7-day average acrophase ϕ0 expressed in degrees (°) and in hours and minutes (hh:mm) after midnight, and coefficient of determination R2. Values given in the table are the population average and the standard deviation. Statistical significance (*) is considered for p < 0.05 according to a nonparametric Kruskal-Wallis test.