TABLE 2.
Oscillation characteristics.
| NREM |
N2 |
N3 |
N2 vs. N3 |
||||
| Mean | SD | Mean | SD | Mean | SD | p | |
| Spindle density F | 4.44 | 0.81 | 4.61 | 0.74 | 4.48 | 0.97 | 0.347 |
| Spindle density C | 4.59 | 0.76 | 4.72 | 0.79 | 4.62 | 0.87 | 0.504 |
| Slow oscillations F | 1,946 | 433 | 728 | 159 | 1,023 | 321 | <0.001*** |
| Slow oscillations C | 1,859 | 390 | 730 | 175 | 978 | 290 | <0.001*** |
| SO–spindle% F | 13.7 | 4.4 | 12.7 | 4.4 | 16.0 | 5.3 | <0.001*** |
| SO–spindle% C | 12.8 | 4.0 | 11.7 | 4.4 | 15.7 | 5.1 | <0.001*** |
| Spindle–SO% F | 17.9 | 5.6 | 27.3 | 8.6 | 15.1 | 5.8 | <0.001*** |
| Spindle–SO% C | 17.9 | 5.6 | 25.2 | 7.1 | 16.2 | 5.6 | <0.001*** |
| PPMean F | 12.7° | 20.1° | 19.5° | 23.5° | 5.6° | 16.6° | 00.010* |
| PPMean C | 20.9° | 17.2° | 30.9° | 20.6° | 11.8° | 14.9° | <0.001*** |
| Upstate% F | 54.64 | 10.72 | 46.32 | 10.36 | 56.18 | 9.83 | <0.001*** |
| Upstate% C | 58.00 | 7.50 | 45.97 | 9.13 | 60.56 | 6.6 | <0.001*** |
Slow oscillations were summed over frontal/central electrodes.
F, frontal; C, central; Spindle density, spindles per minute, averaged over frontal/central electrodes; SO–spindle%, the percentage of spindles occurring during slow oscillation out of all spindles; Spindle–SO%, the percentage of slow oscillations with a spindle occurrence; NREM, non-rapid eye movement sleep; N2–3, NREM sleep stages 2 and 3; p, p-value pairwise t-test comparing N2 and N3 sleep values. ***p-value < 0.001.
*p-value < 0.05.