Table 4.

Multivariable-adjusted Correlations of the Carotid and Aortic AIs with Urinary Measurements

	Carotid AI			Aortic AI
Correlates	β ± SE	P	r2	β ± SE	P	r2
Longitudinal analysis
Sodium concentration (+40 mmol/L)	−1.38 ± 0.66	0.04	0.39	−1.54 ± 0.72	0.02	0.50
Sodium excretion (+60 mmol)	0.10 ± 0.75	0.90	0.01	0.03 ± 0.81	0.96	0.03
Creatinine concentration (+4 mmol/L)	−0.30 ± 0.90	0.74	0.02	−1.22 ± 0.96	0.21	0.47
Creatinine excretion (+4 mmol)	1.55 ± 1.14	0.17	0.28	0.92 ± 1.23	0.46	0.37
Cross-sectional analysis
Sodium concentration (+40 mmol/L)	−1.26 ± 0.70	0.07	0.26	−1.52 ± 0.76	0.04	0.32
Sodium excretion (+60 mmol)	0.33 ± 0.67	0.62	0.25	0.57 ± 0.73	0.43	0.04
Creatinine concentration (+4 mmol/L)	−1.79 ± 0.82	0.02	0.41	−2.78 ± 0.89	0.001	0.96
Creatinine excretion (+4 mmol)	−0.77 ± 0.89	0.38	0.30	−0.95 ± 0.97	0.33	0.06

The AIs were standardized to a heart rate of 75 beats/min. All estimates were adjusted to the covariables are listed in Table 3. β ± SE, P, and r² indicate the effect size ±SE, statistical significance, and the percentage variance of the dependent variable explained by a single covariable, respectively. Effect sizes are expressed for a ~1 SD higher value of the explanatory variables. Abbreviation: AI, augmentation index.