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Figure 3 Sympathetic activity quantified per 100 cardiac beats in groups classified according to the level of arterial pressure. The numbers in parentheses below the x-axis represent the proportions and ratios of subjects with neurovascular compression. Analysis of variance with Newman-Keuls post-test comparisons was used to determine statistical significance. Compared with normal subjects (NT): *p < 0.05, °p < 0.01,  p < 0.001. Compared with high-normal arterial pressure subjects (HN):  p < 0.05, ||p < 0.001. Compared with mild essential hypertension subjects (EHT-1): ¶p < 0.05. EHT-2/3 = severe essential hypertension subjects; MSNA = muscle sympathetic nerve activity; s-MSNA = single-unit muscle sympathetic nerve activity.
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