Table 3.
Within-subject similarity of topographies across nights.
| Comparison | Correlation | Classification | |||||
|---|---|---|---|---|---|---|---|
| N | R | Pcorr < 0.05 | I ≥ II | II ≥ I | |||
| Sigma power | Slow | N2 | 24 | 0.67 ± 0.21*** | 96% | 71%*** | 58%*** |
| N3 | 24 | 0.56 ± 0.25*** | 92% | 38%*** | 46%*** | ||
| Fast | N2 | 26 | 0.69 ± 0.20*** | 96% | 46%*** | 54%*** | |
| N3 | 26 | 0.53 ± 0.23*** | 88% | 23%*** | 15%** | ||
| Spindle density | Slow | N2 | 24 | 0.60 ± 0.26*** | 92% | 33%*** | 46%*** |
| N3 | 24 | 0.52 ± 0.32*** | 75% | 25%*** | 46%*** | ||
| Fast | N2 | 26 | 0.46 ± 0.22*** | 77% | 35%*** | 23%*** | |
| N3 | 26 | 0.24 ± 0.25 *** | 46% | 15%** | 19%*** | ||
| Spindle amplitude | Slow | N2 | 23 | 0.64 ± 0.25*** | 91% | 43%*** | 48%*** |
| N3 | 17 | 0.57 ± 0.26*** | 88% | 47%*** | 47%*** | ||
| Fast | N2 | 25 | 0.59 ± 0.26*** | 88% | 48%*** | 40%*** | |
| N3 | 16 | 0.53 ± 0.22*** | 88% | 31%*** | 38%*** | ||
R: Pearson correlation coefficient; Pcorr < 0.05: percentage of subjects with False Discovery Rate-corrected P values < 0.05; I ≥ II and II ≥ I: classification direction. Significance levels (correlation: one-sample t-test vs. zero; classification: binomial test) indicated by ** < 0.01; *** < 0.001. Note: cases where spindles were not detected on every channel were excluded from spindle amplitude analyses.