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Hourly average: The average BP values are calculated from the average BP value of each hour
separately during 24 hour. This method is chosen to give similar weight to every hour of the day.
In practice this means i.e. for the average value of 24h BP measurement a nocturnal hour is just
as important as any hour during the day despite the fact that during daytime BP probably was
measured more frequently.
Standard deviation (SD): This index indicates the absolute variability of the BP or pulse of a
given period. It is calculated with the following formula:
σ = Standard deviation
N = The number of BP (or pulse) values
µ = The average BP (or pulse) value
Σ = The total sum
It has been shown that the BP variability correlates closely with target-organ damage and with the
incidence of cardiovascular events, independent of absolute BP levels [10].
24-hour: The average BP value calculated from the total number of BP values.
Awake: The average BP values calculated from BP values as measured when the patient was
awake (daytime BP)*.
Asleep: The average BP value calculated from all values as measured when the patient was
sleeping (night time BP)*.
*Before each measurement the day and night period can be set with the button "Ambulatory
Settings". However, when these time points deviate from those as given by the patient afterwards,
the actual awake and asleep period can be programmed with the button "Report settings". The
average awake and asleep values will then be calculated on the basis of these actual time points
as provided by the patient.
Pulse: Heart rate provided in beats per minute.
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