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. Author manuscript; available in PMC: 2013 Jul 9.
Published in final edited form as: Am J Hypertens. 2013 Jan;26(1):95–103. doi: 10.1093/ajh/hps023

Table 5.

Sensitivity Analyses of the Correlations of the Carotid and Aortic AIs with Urinary Sodium Concentration

Carotid AI
 Aortic AI
Correlates β ± SE P r2 β ± SE P r2
Longitudinal analysis (n = 589) −1.66 ± 0.68 0.01 0.57 −1.80 ± 0.74 0.01 0.65
Cross-sectional analysis (n = 552) −1.64 ± 0.72 0.02 0.46 −1.52 ± 0.76 0.048 0.33

The AIs were standardized to a heart rate of 75 beats/min. The covariables considered for entry into the multiple regression model 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 ~1 SD higher value of the explanatory variables. The analysis included 589 and 552 subjects at baseline and follow-up, respectively, with patients on antihypertensive drug treatment excluded. Abbreviation: AI, augmentation index.