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Baseline characteristics of participants in phase I of the Trials of Hypertension Prevention.

Abstract：

:Phase I of the Trials of Hypertension Prevention was designed to test the effectiveness and safety of three life-style (weight loss, sodium restriction, and stress management) and four nutrition supplement (calcium, magnesium, potassium, and fish oil) interventions in reducing diastolic blood pressure (DBP) in persons with a high-normal blood pressure. A total of 2182 persons with a DBP between 80 and 89 mm Hg met the eligibility criteria for participation in phase I and were randomized to one of the active intervention or control treatment groups. Most were white (82%), male (70%), married (76%), nonsmoking (88%), college graduate (53%), full-time employees (91%). The average blood pressure prior to entry into the trial was 124.9 mm Hg systolic and 83.8 mm Hg diastolic. A variety of baseline observations, including sociodemographic characteristics, personal and family medical history, health habits, diet, and biologic measurements, were documented before randomization and compared among the seven active intervention and control groups. As might be expected in a randomized trial of this sample size, the distribution of measured baseline characteristics was virtually identical in the treated and control groups. Based on this finding and the knowledge that randomization procedures were implemented without deviation from the phase I protocol, it is probable that unknown potential confounders were also equally distributed at entry into the study. Given the achievement of high rates of follow-up, subsequent differences in blood pressure are unlikely to have been due to baseline differences between the active treatment and control groups, and can probably be attributed to effects of the active interventions.

journal_name

Ann Epidemiol

journal_title

Annals of epidemiology

authors

Whelton PK,Hebert PR,Cutler J,Applegate WB,Eberlein KA,Klag MJ,Keough ME,Hamill S,Borhani NO,Hollis J

doi

10.1016/1047-2797(92)90062-u

keywords:

subject

Has Abstract,Author List Incomplete

pub_date

1992-05-01 00:00:00

pages

295-310

issue

eissn

1047-2797

issn

1873-2585

pii

1047-2797(92)90062-U

journal_volume

pub_type

临床试验,杂志文章,多中心研究,随机对照试验

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Baseline characteristics of participants in phase I of the Trials of Hypertension Prevention.