Table 4.

EEG (C3/A2) power for the 10 s prior to arousal onset

	Power (µV2)
Frequency band	Inspiratory arousals (n = 229)	Expiratory arousals (n = 125)	P
Total (0.5–60 Hz)	325.0 (286.3–364.8)	322.6 (278.6–373.6)	0.933
δ (0.5–4 Hz)	266.2 (229.3–306.6)	264.7 (222.0–313.6)	0.963
θ (4–8 Hz)	32.6 (30.3–35.1)	32.7 (30.2–35.4)	0.962
α (8–12 Hz)	16.9 (15.3–18.4)	16.9 (15.3–18.6)	0.950
β (12–32 Hz)	10.6 (9.9–11.3)	10 (9.2–10.8)	0.247
γ (32–60 Hz)	0.29 (0.25–0.33)	0.25 (0.21–0.30)	0.158

There were no differences in EEG spectral power between inspiratory and expiratory arousals across all frequency bands. Values are estimated marginal means (confidence interval) from bootstrapped mixed linear model analysis (1000 bootstrap samples, Mersenne Twister seed number = 200,000).

n = number of measurements analyzed.