Table 2. Parameter values of the circadian and ultradian rhythms according SSA analysis.
| Controls | Acute insomnia | p | |
|---|---|---|---|
| mean(T) | 1432 ± 35 | 1429 ± 24 | 0.572 |
| mean(M) | 217 ± 57 | 218 ± 64 | 1.00 |
| mean(A) | 190 ± 55 | 186 ± 60 | 0.431 |
| mean(ϕ0) | 234 ± 23 | 253 ± 25 | 0.013 (*) |
| 15 : 36 ± 1 : 32 | 16 : 52 ± 1 : 40 | ||
| SD(ϕ0) | 26 ± 16 | 23 ± 9 | 0.415 |
| CV(ϕ0) | 0.11 ± 0.06 | 0.09 ± 0.03 | 0.202 |
| Skew(ϕ0) | 0.28 ± 0.97 | 0.09 ± 0.54 | 0.378 |
| Kurt(ϕ0) | 2.84 ± 0.87 | 2.21 ± 0.60 | 0.015 (*) |
| SD(A) | 51 ± 17 | 69 ± 27 | 0.031 (*) |
| CV(A) | 0.28 ± 0.12 | 0.37 ± 0.10 | 0.010 (*) |
| Skew(A) | 0.12 ± 0.72 | 0.31 ± 0.61 | 0.535 |
| Kurt(A) | 2.27 ± 0.67 | 2.34 ± 0.72 | 0.588 |
| γ1 | 0.85 ± 0.17 | 0.73 ± 0.21 | 0.04 (*) |
| γ2 | 0.86 ± 0.15 | 1.02 ± 0.22 | 0.04 (*) |
| R2 | 0.20 ± 0.06 | 0.20 ± 0.05 | 0.979 |
Parameter values of the circadian cycle for period T (min), mesor M (1/min), amplitude A (1/min), acrophase ϕ0 in degrees (°) and 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. (*) Considered to be significant (p < 0.05) according to a nonparametric Kruskal-Wallis test.