Highlights that assessing nocturnal blood pressure dips is prone to measurement bias depending on how day and night are defined.
Measurement is subject to bias EDITOR,--Though I agree with Martin Middeke and Joachim Schrader that many patients with secondary hypertension seem to have a reduced fall in nocturnal blood pressure,1 assessment of the nocturnal dip is susceptible to considerable measurement bias. Variation in the definition of day and night can have an important influence on the calculated nocturnal fall,2 and I would argue that assessment of pressures while subjects are awake and …
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Michael J. Stewart (1994) studied this question.
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