Table 2 BPV definitions

From: Correlation between short-term blood pressure variability and left-ventricular mass index: a meta-analysis

Measure of BPV

Description

24 h s.d.

s.d. over 24 h period

Day s.d.

s.d. over day period usually 0900–2100 h

Night s.d.

s.d. over night period usually 0100–0600 h

wSD

wSD which is the mean of day and night s.d. values corrected for the number of hours included in each of the two sub-periods which attempts to eliminate the effect of nocturnal fall.

wSD=((day s.d. × day hours) + (night s.d. × night hours))/total number of hours

CV

Coefficient of variation=(s.d. over 24 h/mean 24 h) × 100

ARV

Average real variability which averages the absolute differences between successive readings which is the average absolute difference between successive readings. , where k ranges from 1 to N−1 and N is the number of BP measurements

  1. Abbreviations: ARV, average real variability; BP, blood pressure; BPV, blood pressure variability; CV, coefficient of variation; wSD, weighted s.d.
Back to article page