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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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Height distributions by age and sex in Chinese children.
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fig1: Height distributions by age and sex in Chinese children.

Mentions: Figure 1 shows the height distributions of 7, 8, 9 and 10 year-old boys in the original survey sample. The mean height increased with increasing age from 124.1 cm in 7 years to 139.3 in 10 years for boys and from 122.6 cm in 7 years to 139.8 in 10 years for girls (Table 1). As shown in the shaded area in Figure 1, only a small proportion of children were matchable with similar height in all four age groups. We matched 1393 boys and 1146 girls from each of the four age groups by height, sex and geographic region. Therefore, our final analysis included 10 156 children (5572 boys and 4584 girls). After matching, the four age groups had similar means and standard deviations of height (Table 2).


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)

Height distributions by age and sex in Chinese children.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

fig1: Height distributions by age and sex in Chinese children.
Mentions: Figure 1 shows the height distributions of 7, 8, 9 and 10 year-old boys in the original survey sample. The mean height increased with increasing age from 124.1 cm in 7 years to 139.3 in 10 years for boys and from 122.6 cm in 7 years to 139.8 in 10 years for girls (Table 1). As shown in the shaded area in Figure 1, only a small proportion of children were matchable with similar height in all four age groups. We matched 1393 boys and 1146 girls from each of the four age groups by height, sex and geographic region. Therefore, our final analysis included 10 156 children (5572 boys and 4584 girls). After matching, the four age groups had similar means and standard deviations of height (Table 2).

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