TABLE 3 Heart rate variability (HRV) in the time domain before and after surgery

Timing time domain		Before surgery (1) ( n = 119)	After 7 days (2) (n = 109)	After 3 months (3) (n = 102)	After 6 months (4) (n = 102)
ASDNN (ms)	($\overline{X}$±SD)	44.84 ± 20.14	34.54 ± 21.24	46.13 ± 16.53	52.23 ± 16.56
	p		p (1–2) < 0.001	p (1–3) > 0.05	p (1–4) < 0.05
rMSSD (ms2)	($\overline{X}$±SD)	26.73 ± 12.15	22.14 ± 12.82	27.83 ± 12.18	29.14 ± 10.01
	p		p (1–2) = 0.001	p (1–3) > 0.05	p (1–4) > 0.05
pNN 50 (%)	($\overline{X}$±SD)	6.84 ± 7.24	4.94 ± 8.78	7.69 ± 7.74	8.40 ± 6.72
	p		p (1–2) < 0.05	p (1–3) > 0.05	p (1–4) > 0.05
SDNN (ms)	($\overline{X}$±SD)	101.18 ± 34.28	76.65 ± 35.04	107.5 ± 27.27	121.5 ± 25.98
	p		p (1–2) < 0.001	p (1–3) > 0.05	p (1–4) < 0.001