The Dübendorf Study: a population-based investigation on normal values of blood pressure self-measurement.
There is evidence that self-measurement of BP increases precision, reproducibility and prognostic value of BP measurement. However, generally accepted normal values for BP values obtained by self-measurement are still missing. The present study was undertaken to investigate differences between office and self-measured blood pressure; 503 randomly selected inhabitants (265 men and 238 women, age 20-90 years, mean age 46.5 +/- 12.9 years) of the small town of Dübendorf in Switzerland were studied. The subjects were not preselected according their BP levels, only patients taking antihypertensive drugs were excluded. Self-measurement was performed at home by the subjects during 14 days in the morning between 6 and 8 am and in the evening between 6 and 8 pm (mean of 26.7 measurements). Office BP was taken before and after the two week period. Mean office BP (130.0 +/- 16.5/82.1 +/- 11.1 mmHg) was significantly (P < 0.01) higher than mean self-measured BP (123.1 +/- 14.6/77.6 +/- 10.7 mmHg). There was no significant difference between first and second office BP measurement. Morning self-measured BP was lower than evening pressure (delta 4.0/1.4 mmHg, both P < 0.01) and the mean was taken for comparison with office BP.(ABSTRACT TRUNCATED AT 250 WORDS)
Department of Internal Medicine, University Hospital, Zürich, Switzerland.
B
B
Weisser
S
S
Grüne
R
R
Burger
H
H
Blickenstorfer
J
J
Iseli
S H
SH
Michelsen
R
R
Opravil
S
S
Rageth
E R
ER
Sturzenegger
P
P
Walker
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001794:Blood Pressure / Q000502:physiology*; D001795:Blood Pressure Determination / Q000379:methods*; D002940:Circadian Rhythm / Q000502:physiology; D005260:Female; D006801:Humans; D006973:Hypertension / Q000453:epidemiology / Q000503:physiopathology / Q000517:prevention & control; D008297:Male; D008875:Middle Aged; D009819:Office Visits; D012016:Reference Values; D016353:Self-Examination; D013557:Switzerland / Q000453:epidemiology