Table 3.

Analysis of the association between HRV parameters and the Simpson index (%).

Characteristics	Univariate			Model 1			Model 2
	β	95% CI	p-Value	β	95% CI	p-Value	β	95% CI	p-Value
SDNN (ms)	0.113	−0.093 to 0.320	0.282	0.174	−0.020 to 0.369	0.078	0.213	0.012 to 0.413	0.038
CVRR (%)	0.011	−0.012 to 0.034	0.368	0.017	−0.004 to 0.038	0.116	0.020	−0.002 to 0.042	0.070
LF (ms2)	0.743	−6.673 to 8.159	0.844	3.963	−3.174 to 11.100	0.276	4.598	−2.823 to 12.018	0.224
HF (ms2)	0.564	−4.277 to 5.405	0.819	1.024	−3.738 to 5.786	0.673	2.305	−2.589 to 7.199	0.356
LF/HF	0.013	−0.043 to 0.070	0.641	0.034	−0.022 to 0.090	0.236	0.034	−0.024 to 0.092	0.254
HR (bpm)	−0.022	−0.166 to 0.122	0.762	−0.033	−0.175 to 0.109	0.648	−0.051	−0.195 to 0.093	0.484

Model 1: Adjusted for age, sex, and BMI. Model 2: Adjusted for age, sex, BMI, antidiabetic, antihyperlipidemic, antihypertensive, physical activity (non-winter and winter months), smoking, and alcohol consumption. Abbreviations: BMI, body mass index; CI, confidence interval; CVRR, coefficient of variation of RR intervals; HF, high-frequency component power; HR, heart rate; HRV, heart rate variability; LF, low-frequency component power; SDNN, standard deviation of RR intervals.