Polysomnographic values in healthy children*

	Mean ± SD	Range	Recommended normal values	Children classified as abnormal n (percent)
Apnea index (n/h)	0.1 ± 0.5	0 to 3.1	≤ 1^¶	1 (2)
Maximum PETCO2 (mmHg)	46 ± 4	38 to 53	≤ 53^¶	0 (0)
Minimum PETCO2 (mmHg)	38 ± 3	28 to 44	NA	NA
Change in PETCO2 (mmHg)	7 ± 3	2 to 11	≤ 13	0
Duration of hypoventilation (percent TST)	6.9 ± 19.1	0 to 90.5	≤ 60^Δ	3 (6)
Maximum SaO2 (percent)	100 ± 1	98 to 100	NA	NA
Minimum SaO2 (percent)	96 ± 2	89 to 98	≥ 92^Δ	2 (4)
Desaturation >4 percent/h TST (n)	0.3 ± 0.7	0 to 4.4	≤ 1.4^Δ	1 (2)
Change in SaO2 (percent)	4 ± 2	0 to 11	≤ 8^¶	2 (4)

Apnea index: number of obstructive apneas of any length per hour of sleep; TST: total sleeping time.
* The number of children classified as abnormal represents the number of children who would be judged to have an abnormality based on the recommended values. Apnea index is defined as the number N of obstructive apneas of any length per hour of sleep.
¶ Recommended normal values based on mean ± 2 SD when parameters follow a normal distribution.
Δ For data that are not normally distributed, the recommended normal values are based on inclusion of 97 percent of subjects tested for one-tailed distribution.

Reproduced with permission from: Marcus EL, Omlin K, Basinski D, et al. Normal polysomnographic values for children and adolescents. Am Rev Respir Dis 1992; 146:1236.

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Polysomnographic values in healthy children*