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

Wang Z, Ma J, Dong B, Song Y, Hu PJ, Zhang B - J Hum Hypertens (2011)

Bottom Line: 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.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.

View Article: PubMed Central - PubMed

Affiliation: Centre for Chronic Disease, School of Medicine, the University of Queensland, Queensland, Australia. z.wang@uq.edu.au

ABSTRACT
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.

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Systolic and diastolic blood pressure levels before and after matching by height in Chinese children.
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fig2: Systolic and diastolic blood pressure levels before and after matching by height in Chinese children.

Mentions: After matching by height, sex and geographic region, the trend of a sharp increase in systolic and diastolic blood pressure levels over age disappeared (Figure 2). Both systolic and diastolic blood pressure levels were quite similar among the four age groups. The differences among the four groups were not statistically significant for both boys and girls in both systolic and diastolic blood pressure values (Table 2). The absolute differences among the four groups are small and not statistically significant. The maximum difference in diastolic blood pressure was observed between 7 and 10 year-old girls, which was only 0.6 mm Hg (95% confidence interval: −0.1, 1.3). The maximum difference in systolic blood pressure was also only 0.6 mm Hg (95% confidence interval: −1.3, 0.1) observed between 7 and 8 year-old boys.


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

Wang Z, Ma J, Dong B, Song Y, Hu PJ, Zhang B - J Hum Hypertens (2011)

Systolic and diastolic blood pressure levels before and after matching by height in Chinese children.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3376308&req=5

fig2: Systolic and diastolic blood pressure levels before and after matching by height in Chinese children.
Mentions: After matching by height, sex and geographic region, the trend of a sharp increase in systolic and diastolic blood pressure levels over age disappeared (Figure 2). Both systolic and diastolic blood pressure levels were quite similar among the four age groups. The differences among the four groups were not statistically significant for both boys and girls in both systolic and diastolic blood pressure values (Table 2). The absolute differences among the four groups are small and not statistically significant. The maximum difference in diastolic blood pressure was observed between 7 and 10 year-old girls, which was only 0.6 mm Hg (95% confidence interval: −0.1, 1.3). The maximum difference in systolic blood pressure was also only 0.6 mm Hg (95% confidence interval: −1.3, 0.1) observed between 7 and 8 year-old boys.

Bottom Line: 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.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.

View Article: PubMed Central - PubMed

Affiliation: Centre for Chronic Disease, School of Medicine, the University of Queensland, Queensland, Australia. z.wang@uq.edu.au

ABSTRACT
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.

Show MeSH
Related in: MedlinePlus