Table 6.

Stepwise multiple regression analysis for quality of sleep and its related factors.

Predictive Factors	B	ß	R	R2	t	p
Constant	11.416				6.550	<0.0001
TP	−0.001	−0.528	0.425	0.164	−3.963	<0.0001
Heart rate	−0.069	−0.302	0.512	0.231	−2.271	0.028

TP: total power HRV.