Table 7.
Genetic variance analysis, type of estimate applied (GCT: combined among- and within-twin pair component estimate, GWT: within-pair estimate) and intraclass correlation coefficients (ICCs) for spindle parameters in slow wave sleep.
| Variable | Type | P | Analysis | ICC MZ | ICC DZ | ICC MZ cn | ICC DZ cn |
|---|---|---|---|---|---|---|---|
| EEG channel: F3A2 | |||||||
| Number of spindles | Slow* | − | − | 0.94 (0.46, 0.12) | 0.14 (0.61, 0.18) | 0.92 (0.35, 0.09) | 0.76 (0.46, 0.13) |
| Fast | 0.204 | GWT | 0.41 (0.53, 0.12) | 0.45 (0.76, 0.14) | 0.84 (0.41, 0.08) | 0.93 (0.61, 0.11) | |
| Spindle density | Slow* | − | − | 0.96 (0.47, 0.12) | 0.05 (0.62, 0.18) | 0.96 (0.32, 0.08) | 0.91 (0.46, 0.13) |
| Fast | 0.677 | GWT | 0.45 (0.55, 0.12) | 0.51 (0.74, 0.17) | 0.81 (0.35, 0.08) | 0.89 (0.57, 0.11) | |
| Spindle length | Slow | <0.001 | GCT | 0.98 (0.57, 0.11) | 0.45 (0.69, 0.18) | 0.92 (0.42, 0.08) | 0.89 (0.49, 0.13) |
| Fast | 0.010 | GWT | 0.78 (0.44, 0.13) | 0.42 (0.64, 0.19) | 0.66 (0.35, 0.09) | 0.85 (0.44, 0.13) | |
| Spindle amplitude | Slow | <0.001 | GCT | 0.89 (0.45, 0.13) | 0.16 (0.65, 0.20) | 0.91 (0.34, 0.09) | 0.78 (0.45, 0.13) |
| Fast | <0.001 | GCT | 0.83 (0.48, 0.12) | −0.30 (0.61, 0.19) | 0.88 (0.34, 0.08) | 0.60 (0.47, 0.13) | |
| Spindle frequency | Slow | 0.052 | GWT | 0.91 (0.45, 0.12) | 0.81 (0.66, 0.19) | 0.93 (0.33, 0.08) | 0.97 (0.48, 0.13) |
| Fast | 0.027 | GWT | 0.86 (0.49, 0.13) | 0.73 (0.58, 0.18) | 0.85 (0.35, 0.09) | 0.90 (0.48, 0.13) | |
| EEG channel: P3A2 | |||||||
| Number of spindles | Slow | 0.005 | GCT | 0.88 (0.42, 0.12) | 0.45 (0.66, 0.19) | 0.89 (0.34, 0.08) | 0.87 (0.46, 0.13) |
| Fast | 0.049 | GWT | 0.54 (0.49, 0.11) | 0.15 (0.71, 0.19) | 0.90 (0.35, 0.09) | 0.83 (0.54, 0.12) | |
| Spindle density | Slow | 0.030 | GWT | 0.90 (0.53, 0.13) | 0.64 (0.70, 0.20) | 0.93 (0.36, 0.09) | 0.95 (0.50, 0.13) |
| Fast | 0.071 | GWT | 0.68 (0.45, 0.12) | 0.21 (0.59, 0.18) | 0.88 (0.34, 0.08) | 0.81 (0.50, 0.13) | |
| Spindle length | Slow | <0.001 | GCT | 0.88 (0.57, 0.11) | 0.46 (0.70, 0.20) | 0.88 (0.39, 0.08) | 0.90 (0.47, 0.13) |
| Fast | 0.020 | GWT | 0.74 (0.48, 0.13) | 0.47 (0.63, 0.19) | 0.80 (0.34, 0.09) | 0.94 (0.50, 0.13) | |
| Spindle amplitude | Slow | 0.004 | GWT | 0.83 (0.44, 0.12) | 0.41 (0.63, 0.19) | 0.79 (0.33, 0.09) | 0.73 (0.48, 0.12) |
| Fast | 0.004 | GCT | 0.80 (0.49, 0.12) | 0.29 (0.62, 0.19) | 0.84 (0.35, 0.09) | 0.56 (0.48, 0.13) | |
| Spindle frequency | Slow | 0.049 | GWT | 0.82 (0.45, 0.12) | 0.69 (0.63, 0.19) | 0.88 (0.33, 0.08) | 0.93 (0.48, 0.13) |
| Fast | 0.001 | GWT | 0.94 (0.47, 0.13) | 0.77 (0.64, 0.18) | 0.93 (0.32, 0.08) | 0.96 (0.48, 0.13) |
Abbreviations explanation as in Table 6. *Analysis of variance not applicable (significant differences between the means in DZ and MZ twin set).