Table 4

Normal SaO₂ levels at different altitudes

Altitude (m)	Location	n studied	Age	SpO₂ (%)		Reference	Year
Values given are those in (quiet) sleep.
*Ranges for babies gestated and born to immigrant Chinese mothers, and babies whose families have lived at this altitude for innumerable generations.
Sea level	UK	70	2–16 y, mean 8 y	Range	95.8–100	31	1993
				Median	99.5
Sea level	Peru	189	2 mth–5 y	Range	96–100	32	1991
				Mean	98.7±1.1
1610	Colorado	150	<48 h	95% CI	88 to 97	33	1991
				Mean	93.0±0.2
			3 mth	95% CI	86 to 97
				Mean	92.2±0.4
1670	Nairobi	87	7 days–36 mth	Range	89.3–99.3	34	1993
				Mean	95.7±1.6
2640	Bogota	189	5 days–24 mth	Range	84–100	35	1992
				Mean	93.3±2.1
2800	Colorado	72	3–670 days	Range	88–97	36	1993
				Mean	91.7±0.2
3100	Colorado	14	6 h–4 mth	Range	81–91	30	1993
			1 wk	Mean	80.6±5.3
			4 mth	Mean	86.1±4.6
3658	Tibet	15	6 h–4 mth	Immigrants *	76–90	14	1995
				Indigenous	86–94
3750	Peru	153	2–60 mth	Range	81–97	32	1991
				Mean	88.9±2.9
4540	Peru		0.5–72 h	Range	57–75	37	1971