Table 2.

Characteristics of low, moderate, and high dose groups during the heart rate variability (HRV) recordings.

Demographic characteristic	Low ≤0.25 g/kg (n=1752)	Moderate >0.25-0.75 g/kg (n=2194)	High >0.75 g/kg (n=716)	P value
Number of male subjects, n (%)	671 (38.29)	1010 (46.03)	380 (53.1)	<.001a
Age in years, mean (SD)	45.6 (9.0)	46.3 (9.3)	42.3 (10.7)	<.001b
Physical activity class, mean (SD)	4.9 (1.6)	4.9 (1.7)	4.6 (1.9)	.59b
Body-mass index in kg/m2, mean (SD)	25.9 (4.2)	26.0 (3.8)	25.8 (3.7)	.10b
Weight in kg, mean (SD)	77.5 (16.2)	77.9 (14.3)	78.1 (14.1)	.31b

^aChi-square test.

^bOne-way analysis of variance (ANOVA) adjusted for gender.