Combination of Composite Autonomic Symptom Score 31 and Heart Rate Variability for Diagnosis of Cardiovascular Autonomic Neuropathy in People with Type 2 Diabetes

Table 3

Correlation between COMPASS 31 score, HRV indices, and CARTs.

Variables	CARTs score		COMPASS 31 score
		value		value
COMPASS 31 score	0.547	<0.001	/	/
HRV indices
SDNN (ms)	−0.722	<0.001	−0.397	<0.001
PNN50 (%)	−0.449	<0.001	−0.175	0.078
RMSSD (ms)	−0.284	0.004	−0.120	0.227
LF (ms^2)	−0.637	<0.001	−0.306	0.002
HF (ms^2)	−0.456	<0.001	−0.149	0.134
LF/HF ratio	−0.350	<0.001	−0.222	0.024

CARTs: cardiovascular autonomic reflex tests; COMPASS 31: Composite Autonomic Symptom Score 31; HRV: heart rate variability; SDNN: the standard deviation of the NN intervals; PNN50: the percentage of adjacent NN intervals with a difference greater than 50 ms; RMSSD: the root mean square differences of successive NN intervals; LF: low-frequency power; HF: high-frequency power.