Table 5.

Multiple linear regression analyses performed by backward regression.

Model	Independent factor	β	Lower 95% interval	Upper 95% interval	P value	R 2
Model 1a (SD)	24 h SBPV	0.024	0.009	0.038	0.002	0.159
	Constant	0.662	0.486	0.838	0.000
Model 2b (CV)	24 h SBPV	0.028	0.010	0.045	0.003	0.141
	Constant	0.671	0.488	0.853	0.000
Model 3c (ARV)	Daytime SBPV	0.027	0.010	0.043	0.002	0.157
	Constant	0.689	0.527	0.851	0.000
Model 4d (Mix)	Daytime SBPV (ARV)	0.027	0.010	0.043	0.002	0.157
	Constant	0.689	0.527	0.851	0.000

^aModel 1: using the SDs of blood pressure as the independent factors. ^bModel 2: using the coefficients of variation of blood pressure as the independent factors. ^cModel 3: using average real variabilities of blood pressure as the independent factors. ^dModel 4: backward regression using the significant independent factors from model 1 to model 3.