Table 2.
Characteristics of sleep spindles detected by all scorers (consensus) and of spindles detected only by a single scorer in stage 2 sleep.
| Consensus (N = 1556) Mean (SD) | Only CWT (N = 726) Mean (SD) | Only SIESTA (N = 583) Mean (SD) | Only Human (N = 243) Mean (SD) | |
|---|---|---|---|---|
| Spindle | 12.51 (3.46) | 8.54 (2.30) | 9.24 (3.54) | 7.92 (4.00) |
| amplitude (μV)a | ||||
| Spindle | 13.75 (1.15) | 11.94 (1.74) | 13.10 (1.23) | 12.05 (2.70) |
| frequency (Hz) | ||||
| Spindle | 0.88 (0.33) | 0.81 (0.42) | 0.74 (0.41) | 0.99 (0.47) |
| length (s) | ||||
| Delta (μV)b | 6.74 (4.16) | 10.22 (7.44) | 7.26 (4.74) | 7.45 (6.38) |
| Theta (μV)b | 4.61 (2.30) | 6.56 (4.22) | 4.82 (2.95) | 5.95 (4.93) |
| Alpha (μV)b | 3.80 (1.94) | 5.10 (2.33) | 4.34 (3.18) | 6.27 (3.98) |
| Spindle to | 2.56 (1.15) | 1.22 (0.58) | 1.73 (0.72) | 1.22 (0.64) |
| background ratioc |
Sleep spindles were scored in the C3A2 EEG channel. aComputed from amplitude spectrum as described in “Computation of Sleep Spindle Amplitude and Frequency” Section. bMean amplitude in chosen frequency from amplitude spectrum (delta: 2–4.5 Hz, theta: 4.6–7.5 Hz, alpha: 7.6–11 Hz). cSpindle amplitude divided by mean amplitude in 2–11 Hz background frequency computed from amplitude spectrum.