Table 3.

Linear index values of heart rate variability (time domain) of obese and eutrophic children.

Variables	Obese	Eutrophic	p
RR interval (ms)	652.09 ± 71.82 (657.50)*	680.65 ± 75.44 (675.00)	0.035a
	[632.85–671.33]	[661.94–699.35]
SDNN	37.18 ± 26.26 (34.00)	42.58 ± 10.48 (44.00)	0.001b
	[30.14–44.21]	[39.99–45.18]
RMSSD	27.45 ± 12.70 (27.80)	31.92 ± 10.34 (32.80)	0.038a
	[24.04–30.85]	[29.36–34.48]
pNN50	9.65 ± 10.14 (5.95)	12.08 ± 8.91 (12.20)	0.0318b
	[6.94–12.37]	[9.87–14.29]

^*Mean ± SD (median); [95% CI];

^asignificant difference between groups (Student's t-test);

^bsignificant difference between groups (Mann-Whitney U-test); ms: milliseconds; SDNN: standard deviation normal-to-normal intervals; RMSSD: root mean square of successive differences; pNN50: percentage of differences between adjacent normal-to-normal intervals that are greater than 50 ms