Numbers of studies reporting 24-hour blood pressure variability measures as a prognostic index of cardiovascular events.

Providing continuous expressions of relative risk. * Includes studies reporting relative risks/hazard ratios based on pooled data from other studies. †Further data from an extra study could not be included as there was insufficient information to extract the data ‡Night-day ratio; SD—standard deviation, ARV—average real variability, CoV—coefficient of variation Numbers of studies reporting 24-hour blood pressure variability measures as a prognostic index of cardiovascular events.