Table 3.

Correlation of clinical factors with HRV in gastric cancer

	SDNN < 20 ms	SDNN ≥20 ms	P value
Tumor size			0.000
≤ 2 cm	13	20
2–5 cm	157	69
> 5 cm	86	38
T stage			0.000
T1–T2	38	39
T3–T4	218	38
LN involvement			0.000
Negative	34	44
Positive	222	83
TNM stage			0.000
I + II	43	57
III + IV	213	70

SDNN standard deviation of all normal-to-normal intervals, RMSSD root mean square successive difference, LN lymph node