An association between heart rate variability and pediatric obstructive sleep apnea

Table 2 Heart rate variability parameters of children with primary snoring or obstructive sleep apnea (OSA).

Factors	Primary snoring n = 16	OSA n = 65	P-value
Time domain
SDNN, ms	115 (90–194)	111 (40–186)	0.165
SDANN, ms	104 (71–184)	94 (35–178)	0.056
ASDNN, ms	57 (40–121)	61 (17–100)	0.721
rMSSD, ms	38 (28–73)	38 (9–64)	0.830
Frequency domain
LF, ms²	22.33 (13.52–45.81)	23.82 (5.81–43.09)	0.581
HF, ms²	18.46 (12.20-54.51)	19.79 (2.05–36.96)	0.896
LF/HF ratio	1.20 (0.81–1.71)	1.28 (0.87–2.83)	0.088

Note: Data presented as median (range) or number (percentage); SDNN: standard deviation of all normal interval; SDANN: standard deviation of the normal interval means of every 5 min; ASDNN: average of the standard deviations of all R-R intervals for all 5-min segments in the 24-h recording; rMSSD: root-mean square of difference between adjacent normal interval; LF: low frequency; HF: high frequency

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