Table 2. Holter parameters of the patients.

	Controls N = 72	Patients undergoing peritoneal dialysis N = 65	p value
Time domain analysis
Mean RR, ms	771 (677; 850)	799 (731–895)	0.149
SDRR, ms	76.8 (62.6–93.2)	44.1 (30.3–65.5)	<0.001
pNN50, %	2.04 (0.62–4.96)	0.53 (0.08–3.19)	0.001
pNN20, %	20.2 (9.9–33.9)	7.51 (2.74–18.51)	<0.001
Frequency domain analysis
Very low frequency	931 (689–1365)	713 (431–1424)	0.092
Low frequency	261 (171–452)	153 (62–370)	0.001
High frequency	87 (44–166)	55 (31–120)	0.037
Low/high frequency ratio	3.17 (1.89–4.90)	2.31 (1.31–3.60)	0.013
Detrended fluctuation analysis
α1	1.14 (1.09–1.30)	1.17 (1.01–1.37)	0.552
α2	1.19 (1.13–1.28)	1.20 (1.13–1.28)	0.760
Multiscale entropy
Slope 1–5	0.059 (0.011–0.103)	0.043 (0.009–0.071)	0.098
Scale 5	2.75 (2.40–3.01)	2.06 (1.77–2.48)	<0.001
Area 1–5	6.06 (5.16–6.64)	4.70 (3.87–5.54)	<0.001
Area 6–20	22.29 (19.90–23.61)	18.2 (15.9–20.9)	<0.001

Data were presented as median (25^th–75^th percentile). SDNN = standard deviation of normal RR intervals; pNN20 = percentage of the absolute change in consecutive normal RR interval exceeds 20 ms; pNN50 = percentage of the absolute change in consecutive normal RR interval exceeds 50.