Table 3 Factors contributing to changes in blood pressure at 1 week after the earthquake

(A) Pre dialysis
	Change in systolic blood pressure				Change in diastolic blood pressure
			Multivariate				Multivariate
	Univariate		R²=0.09		Univariate		R²=0.02
	r	P-value	B	P-value	r	P-value	B	P-value
Age (years)	0.10	0.06		NS	0.08	0.12		NS
Gender (male)	−0.12	0.03		NS	−0.06	0.18		NS
Dialysis vintage (years)	−0.03	0.32		NS	−0.07	0.15		NS
Hypertension	−0.11	0.05		NS	−0.12	0.33		NS
Diabetes	−0.05	0.23		NS	−0.01	0.42		NS
Hyperlipidemia	0.03	0.31		NS	0.05	0.22		NS
Cardiovascular disease	0.07	0.15		NS	0.07	0.13		NS
Pre-dialysis systolic/diastolic blood pressure at baseline (mm Hg)	−0.33	<0.01	−0.29	<0.01	−2.00	<0.01		NS
Pre-dialysis heart rate at baseline (per min)	−0.07	0.34		NS	−0.05	0.42		NS
RAS-I	−0.15	0.01		NS	−0.15	0.01	−0.15	0.03
CCB	−0.02	0.38		NS	−0.05	0.20		NS
α-Blockers	−0.19	<0.01	−0.15	0.03	−0.16	<0.01		NS
β-Blockers	−0.09	0.08		NS	−0.09	0.09		NS
Diuretics	−0.09	0.09		NS	−0.01	0.41		NS
DRI	−0.08	0.11		NS	−0.12	0.03		NS

(B) Post dialysis
	Change in systolic blood pressure				Change in diastolic blood pressure
			Multivariate				Multivariate
	Univariate		R²=0.10		Univariate		R²=0.03
	R	P-value	B	P-value	r	P-value	B	P-value
Age (years)	−0.01	0.39		NS	−0.01	0.40		NS
Gender (male)	−0.01	0.43		NS	−0.05	0.22		NS
Dialysis vintage (years)	−0.005	0.47		NS	0.02	0.38		NS
Hypertension	0.003	0.48		NS	−0.005	0.47		NS
Diabetes	−0.04	0.28		NS	0.002	0.48		NS
Hyperlipidemia	0.001	0.49		NS	0.03	0.29		NS
Cardiovascular disease	0.04	0.25		NS	0.02	0.35		NS
Post-dialysis systolic/ diastolic blood pressure at baseline (mm Hg)	−0.25	<0.01	−0.30	<0.01	−0.18	<0.01	−0.19	<0.01
Post-dialysis heart rate at baseline (per min)	0.06	0.38		NS	0.02	0.38		NS
RAS-I	0.03	0.33		NS	−0.01	0.43		NS
CCB	0.11	0.05	0.18	0.01	0.05	0.20		NS
α-Blockers	−0.03	0.29		NS	−0.11	0.05		NS
β-Blockers	0.01	0.39		NS	−0.10	0.06		NS
Diuretics	−0.06	0.18		NS	−0.06	0.17		NS
DRI	−0.02	0.37		NS	−0.02	0.35		NS

Abbreviations: CCB calcium channel blocker; CVD, cardiovascular disease; DRI, direct renin inhibitor; RAS-I, renin–angiotensin inhibitor.
Multivariate logistic regression analysis included pre-dialysis changes in systolic (or diastolic) blood pressure at 1 week (A) and post-dialysis changes in systolic (or diastolic) blood pressure at 1 week (B) as dependent variables. Adjusted potential confounding variables comprised age, gender, dialysis vintage, hypertension, diabetes, hyperlipidemia, CVD, pre- (or post-) dialysis systolic (or diastolic) blood pressure at baseline, pre- (or post-) dialysis heart rate at baseline, RAS-I, CCB, α-blockers, β-blockers, diuretics and DRI.

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