Hypertensive Treatment and Epidemiological Analyses
研究概览
详细说明
BACKGROUND:
With the use of antihypertensive medication increasing steadily over the last 25 years, treatment for hypertension is now common. Given the high prevalence of treatment for hypertension, researchers can no longer assume that participants in epidemiologic studies represent natural blood pressure measures, as opposed to treated blood pressure measures. The effect of this high prevalence of treatment, however, has not been fully investigated. Although it might seem that studies of "natural history" are no longer relevant, great interest currently exists in establishing both environmental and genetic determinants of blood pressure. Additionally, there currently is a renewed interest in refining treatment guidelines. For example, the need to account for absolute as well as relative risk has been hotly debated in recent years. The need will continue to exist, therefore, to analyze observational data sets to meet the evolving interest in the determinants of blood pressure and to meet the requirements for more refined risk estimates.
DESIGN NARRATIVE:
To investigate the effect of blood pressure treatment on the analysis of epidemiologic studies, the investigators conducted two interrelated analyses using simulation studies and data from five observational studies: The Framingham Heart Study; the NHANES I, II, and III cohorts; and The International Collaborative Study of Hypertension in Blacks (ICSHIB). They first conducted simulation studies to examine the behavior of different methodologies in each of two common analytic settings: relating body mass index to level of systolic blood pressure and relating level of systolic blood pressure to coronary heart disease mortality. They planned to use the data from the five studies to derive the parameters for use in the simulation studies. In these studies they quantified the level of bias that results from ignoring the presence of blood pressure treatment in observational data. After conducting their simulations studies, they repeated the analysis of the relationship between body mass index and systolic blood pressure using available empirical data.
The study completion date listed in this record was obtained from the "End Date" entered in the Protocol Registration and Results System (PRS) record.
研究类型
参与标准
资格标准
适合学习的年龄
接受健康志愿者
有资格学习的性别
描述
学习计划
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合作者和调查者
研究记录日期
研究主要日期
学习开始
研究完成 (实际的)
研究注册日期
首次提交
首先提交符合 QC 标准的
首次发布 (估计)
研究记录更新
最后更新发布 (估计)
上次提交的符合 QC 标准的更新
最后验证
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