Table 2.

Number of analyzed desaturations in different subgroups based on duration and depth of desaturations

	Desaturation without an arousal (n = 10,622)	Desaturation with an arousal (n = 10,333)
Duration
10 s ≤ Tdes < 20 s	2,671	1,460
20 s ≤ Tdes < 30 s	3,589	3,010
30 s ≤ Tdes < 45 s	2,927	3,976
45 s ≤ Tdes	1,435	1,887
Depth
3% ≤ Δ$\text{S}{\text{p}}_{{\text{O}}_2}$ < 4.5%	6,952	4,346
4.5% ≤ Δ$\text{S}{\text{p}}_{{\text{O}}_2}$ < 6%	1,200	1,129
6% ≤ Δ$\text{S}{\text{p}}_{{\text{O}}_2}$ < 7.5%	1,225	1,489
7.5% ≤ Δ$\text{S}{\text{p}}_{{\text{O}}_2}$	1,245	3,369

Statistical tests were performed using the chi-squared test. The difference between distributions of desaturations with and without accompanied arousals in both duration and depth groups is statistically significant. T_des, desaturation duration; Δ$\text{S}{\text{p}}_{{\text{O}}_2}$, drop in the blood oxygen saturation.