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NCT00005501 Clinical Trial

Hypertensive Treatment and Epidemiological Analyses

Hypertension Clinical Trial

Clinical Trial Details — Status: Completed

Administrative data
NCT number NCT00005501
Other study ID # 5019
Secondary ID R03HL059155
Status Completed
Phase N/A
First received May 25, 2000
Last updated February 17, 2016
Start date September 1998
Est. completion date August 2000

Study information
Verified date December 2000
Source National Heart, Lung, and Blood Institute (NHLBI)
Contact n/a
Is FDA regulated No
Health authority United States: Federal Government
Study type Observational

Clinical Trial Summary

To determine the impact of the treatment of hypertension on the epidemiological analyses of blood pressure from observational studies.

Description:

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.

Recruitment information / eligibility
Status Completed
Enrollment 0
Est. completion date August 2000
Est. primary completion date
Accepts healthy volunteers No
Gender Male
Age group N/A to 100 Years
Eligibility No eligibility criteria

Study Design

N/A

Related Conditions & MeSH terms

Locations
Country Name City State
n/a

Sponsors (1)
Lead Sponsor Collaborator
National Heart, Lung, and Blood Institute (NHLBI)
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