Table 5.

Maximum likelihood estimation of variance components from adjusted* mixed-effects multilevel models for spindle amplitude and duration variances with confidence intervals

Characteristic	Detector	Optimal model	Genetic variance	Common variance
Duration	a2	ADE	0.748 (0.643, 0.854)**
	a3	AE	0.794 (0.701, 0.888)**
	a4	AE	0.637 (0.485, 0.790)**
	a5	AE	0.742 (0.627, 0.857)**
	a7	AE	0.719 (0.598, 0.840)**
	a8	AE	0.777 (0.677, 0.877)**
	a9	AE	0.774 (0.675, 0.873)**
	a10	CE		0.632 (0.508, 0.755)**
Amplitude	a2	AE	0.800 (0.715, 0.884)**
	a3	AE	0.781 (0.685, 0.877)**
	a4	AE	0.775 (0.674, 0.875)**
	a5	AE	0.783 (0.687, 0.879)**
	a7	AE	0.735 (0.616, 0.855)**
	a8	AE	0.798 (0.707, 0.889)**
	a9	AE	0.716 (0.593, 0.838)**
	a10	AE	0.752 (0.645, 0.860)**
Frequency	a2	CE		0.649 (0.533, 0.765)
	a3	ACE	0.311 (–0.045, 0.666)	0.485 (0.145, 0.825)
	a4	CE		0.699 (0.596, 0.802)
	a5	CE		0.740 (0.649, 0.831)
	a7	CE		0.776 (0.696, 0.856)
	a8	AE	0.807 (0.728, 0.886)**
	a9	ACE	0.242 (–0.032, 0.516)	0.604 (0.339, 0.869)*
	a10	AE	0.759 (0.664, 0.855)**

* Adjusted for age, sex, and age by sex interaction.

^**  p < 0.0001.