Table 2.

Change in apnea length between apneas preceded by a hyperpnea with arousal (cases) and those preceded by a hyperpnea without arousal (controls).

	Cases	Controls	Difference	p
Apnea length (s)	25.7 ± 7.1	23.6 ± 6.2	2.1 ± 3.4	0.026
Hyperpnea length (s)	40.0 ± 9.2	41.8 ± 8.7	−1.8 ± 3.6	0.051
Cycle length (s)	65.7 ± 13.2	65.5 ± 13.1	0.2 ± 2.6	0.71
Mean SpO2 during the hyperpnea (%)	91.6 ± 2.6	91.6 ± 2.6	0.0 ± 0.1	0.25

The corresponding change in hyperpnea and cycle length are also reported. Data are expressed as mean ± SD. RU, relative units.