Table 2. Correlations between sleep spindle parameters and intelligence in full-night sleep recordings of 57 healthy young male subjects.

	Night slow spindles						Night fast spindles
	Density		Duration		Amplitude		Density		Duration		Amplitude
	r	p	r	p	r	p	r	p	r	p	r	p
F3	0.087	0.518	0.002	0.989	0.032	0.814	−0.170	0.206	−0.009	0.946	0.053	0.698
F4	−0.020	0.884	−0.016	0.906	0.024	0.860	−0.160	0.234	0.054	0.690	0.073	0.589
C3	0.144	0.284	−0.017	0.902	0.046	0.734	−0.226	0.091	−0.014	0.917	0.101	0.453
C4	0.053	0.696	−0.035	0.796	0.005	0.972	−0.180	0.181	0.023	0.867	0.126	0.349
O1	0.123	0.363	−0.059	0.666	0.017	0.901	−0.269	0.043	−0.029	0.833	0.076	0.574
O2	0.127	0.345	−0.057	0.674	0.017	0.899	−0.281	0.034	−0.029	0.830	0.037	0.784

No correlation coefficients remained significant after correcting for multiple comparisons.