TABLE 4

Desaturation characteristics in the 5-min segments in the severity groups

Severity group	n_desat	Duration (s)	Depth (%)	DesSev (%)
Events per 5-min segment
Ev₀	0 (0–0)	0 (0–0)	0 (0–0)	0 (0–0)
Ev_Q1	1 (0–1)	12.0 (0–29.0)**	3.0 (0–3.0)**	0.062 (0–0.251)**
Ev_Q2	2 (1–3)	27.0 (8.1–39.2)**	3.0 (2.0–4.0)**	0.335 (0.037–0.825)**
Ev_Q3	4 (2–5)	34.8 (24.6–46.3)**	4.3 (3.3–6.7)**	1.250 (0.500–2.726)**
Ev_Q4	7 (5–8)	30.5 (24.4–37.3)**	5.7 (4.0–9.6)**	2.662 (1.328–4.916)**
Desaturation severity
DesSev₀	0 (0–0)	0 (0–0)	0 (0–0)	0 (0–0)
DesSev_Q1	1 (1–1)	22.1 (17.0–30.0)^,##**	3.0 (3.0–3.0)^,##**	0.161 (0.105–0.226)^,##**
DesSev_Q2	2 (2–3)	31.5 (24.2–41.0)^,##**	3.5 (3.0–4.0)^,##**	0.531 (0.402–0.685)^,##**
DesSev_Q3	4 (3–6)	34.3 (26.8–43.7)^,##**	4.3 (3.7–5.3)^,##**	1.504 (1.166–1.923)^,##**
DesSev_Q4	6 (5–8)	37.8 (30.7–47.2)^,##**	9.0 (6.5–13.6)^,##**	4.471 (3.305–6.948)^,##**

Data are presented as median (interquartile range). Statistical significance of differences between 1) Ev groups, 2) DesSev groups and 3) the corresponding Ev and DesSev groups was assessed using the Wilcoxon signed-rank test. The bolded values denote a statistically significant (p<0.01) difference compared to the corresponding reference group. Ev₀: reference group with 0 respiratory events starting during the 5-min segment; Ev_Q1–4: severity groups pooled based on the number of respiratory events (apnoeas/hypopnoeas) starting during the 5-min segment (Ev_Q1=1<Ev_Q2≤3<Ev_Q3≤5<Ev_Q4); DesSev₀: reference group with desaturation severity of 0% during the 5-min segment; DesSev_Q1–4: severity groups pooled based on the desaturation severity during the 5-min segment (0%<DesSev_Q1≤0.305%<DesSev_Q2≤0.906%<DesSev_Q3≤2.463%<DesSev_Q4); n_desat: median number of desaturations within the 5-min segments.**: statistically significant difference (p<0.01) compared to all other Ev or DesSev groups; ^##: statistically significant difference (p<0.01) compared to the corresponding Ev group.