Microlife WatchBP 03 Mode D'emploi page 160

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.