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The variability of blood pressure measurements in children
Insights
This study analyzed blood pressure variation in third graders, finding significant differences between and within children across visits and observers. Consistent observer training is crucial for accurate environmental condition studies.
Area of Science:
- Pediatric Health
- Biostatistics
- Cardiovascular Research
Background:
- Understanding blood pressure variability in children is essential for accurate health assessments.
- Previous research has not fully quantified sources of variation in pediatric blood pressure measurements.
- Environmental factors are increasingly recognized as influences on children's cardiovascular health.
Purpose of the Study:
- To quantify the sources and magnitude of variation in blood pressure measurements among third-grade children.
- To identify key factors contributing to blood pressure variability in pediatric populations.
- To inform the design and evaluation of studies linking children's blood pressure to environmental conditions.
Main Methods:
- Collected blood pressure data from 99 third-grade children.
- Utilized three repeated measurements across three separate visits for each child.
- Analyzed variability within and between children, and across visits and observers.
Main Results:
- Significant variability was observed both between individual children and within children over time (by visit).
- Observer variability also contributed to the overall blood pressure measurements.
- The findings underscore the complexity of measuring stable blood pressure in pediatric subjects.
Conclusions:
- Blood pressure measurement in children is subject to considerable variability from multiple sources.
- Careful consideration of inter-child, intra-child, and observer variability is necessary for robust study design.
- Periodic restandardization of observers is recommended to minimize measurement error in pediatric blood pressure studies.
Abstract:
This study examined the sources and amount of variation present in the blood pressures of 99 third grade children, using data collected from three repeated measurements made on three separate visits. The results highlight factors to consider when planning or evaluating studies designed to relate children's blood pressure levels to environmental conditions. Factors include variability both between and within children by visit and between observers; periodic restandardization of observers during the course of a study is desirable.