Table 2.

Frequency of extreme hypoxemic and hyperoxemic episodes

Episodes(/day)	Auto	Manual	P
< 80% SpO2
Total	103(15–175)	216 (118–352)	< 0.001
< 5 s	42 (22–74)	67 (34–116)	< 0.05
5- < 30 s	45 (22–92)	61 (36–105)	ns
30- < 60 s	9 (3–17)	14 (9–23)	< 0.01
60 - < 120 s	1 (0–3)	6 (3–11)	< 0.001
120+ s	0 (0–1)	2 (1–4)	< 0.001
> 98% SpO2
Total	24 (8–63)	75 (34–147)	< 0.001
< 5 s	11 (3–24)	23 (11–47)	ns
5- < 30 s	11 (4–29)	26 (12–63)	< 0.05
30- < 60 s	3 (0–8)	8 (3–17)	< 0.001
60 - < 120 s	0 (0–3)	3 (1–8)	< 0.001
120+ s	0 (0–1)	1 (0–4)	< 0.001

Hypoxemia is SpO₂ < 80% and hyperoxemia SpO₂ > 98%

Presented as median and interquartile range (IQR)