Comparison of blood pressure levels among four age groups of Chinese children matched by height.

Summary of "Comparison of blood pressure levels among four age groups of Chinese children matched by height."

Hypertension in children is frequently undiagnosed. Normal blood pressure is currently defined as a function of two continuous variables, age and height for each gender. Applying the current cutoff values to assess a child's blood pressure is time consuming. To separate the independent effect of age from that of height on blood pressure, we conducted a multiple group matched study to investigate if blood pressure levels in children with a given height distribution vary with age. An equal number of 2539 Chinese children from each of the four age groups (7, 8, 9 and 10 years) were individually matched by height, sex and geographic region. We used the matching technique to force the four age groups to have an identical height distribution. Systolic and diastolic blood pressures significantly increased with increasing age before matching. After matching, four groups had strikingly similar levels of blood pressures, and the differences among four groups were small and not statistically significant. Once height is taken into consideration, age has little impact on blood pressure. Our findings, if confirmed in children of other ages, suggest that blood pressure percentile charts can be considerably simplified by establishing normal percentiles according to height alone for each gender.Journal of Human Hypertension advance online publication, 12 May 2011; doi:10.1038/jhh.2011.45.


Centre for Chronic Disease, School of Medicine, the University of Queensland, Queensland, Australia.

Journal Details

This article was published in the following journal.

Name: Journal of human hypertension
ISSN: 1476-5527


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Blood pressure levels that are between normotension and hypertension. Individuals with prehypertension are at a higher risk for developing cardiovascular diseases. Generally, prehypertension is defined as SYSTOLIC PRESSURE of 131-139 mm Hg and/or DIASTOLIC PRESSURE of 81-89 when the optimal is 120/80 mm Hg. For diabetics and other metabolism diseases the prehypertension is around 110-129/70-79 mm Hg.

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Persistently high systemic arterial BLOOD PRESSURE. Based on multiple readings (BLOOD PRESSURE DETERMINATION), hypertension is currently defined as when SYSTOLIC PRESSURE is consistently greater than 140 mm Hg or when DIASTOLIC PRESSURE is consistently 90 mm Hg or more.

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