Distribution and Determinants of the Difference Between Diastolic Phase 4 and Phase 5 Blood Pressure

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Abstract
Auscultatory blood pressure measurements from 18 325 male British civil servants were used to examine the relationship between diastolic phase 4 (D4) and phase 5 (D5). The two measures are highly correlated (r=0.98) and this is unaffected by age. The distribution of the difference between the two indices is skewed with a median difference of 1 mmHg. Phase 4 and D5 were recorded at the same level in 31 % of subjects. The difference was 5 mmHg or more in 9% of subjects, and 10 mmHg or more in 1 %. The difference between the two diastolic indices depends partly on the level of blood pressure and body mass index.

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