Table 4 Partial correlation between AHI and absolute spectral power density during NREM sleep after controlling for age and sex.

Variables	Total (n = 171)			SS (n = 42)			OSA (n = 129)
Variables	r*	p value	p corr	r*	p value	p corr	r*	p value	p corr
Slow oscillation	0.101	0.192	>0.999	0.036	0.826	>0.999	0.098	0.274	>0.999
Delta	0.151	0.051	0.360	0.035	0.830	0.906	0.026	0.769	>0.999
Theta	0.126	0.103	0.618	0.146	0.369	>0.999	−0.016	0.861	>0.999
Alpha	0.090	0.247	0.024	0.039	0.812	>0.999	−0.044	0.629	>0.999
Sigma	0.161	0.036	0.216	−0.170	0.295	>0.999	0.087	0.334	>0.999
Beta	0.340	<0.001	<0.001	−0.071	0.663	>0.999	0.251	0.004	0.027

AHI, apnoea-hypopnea index; EEG, electroencephalography; NREM, non-rapid eye movement; SS, simple snoring; OSA, obstructive sleep apnoea; r, Pearson’s r. *Log transformation for spectral EEG was performed before Pearson correlation analysis when both variables deviate from normal distribution. p corr, p value after Bonferroni correction (uncorrected p value × 6) for correction of multiple comparisons. The number in bold indicates significance after Bonferroni correction (p < 0.05).

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