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Hypertension in Elderly Persons

Its Prevalence and Associated Cardiovascular Risk Factors in Tainan City, Southern Taiwan

^a Department of Family Medicine, Medical College, National Cheng Kung University, Tainan, Taiwan

Chih-Jen Chang, Department of Family Medicine, National Cheng Kung University Hospital, No. 138, Sheng-Li Road, Tainan 70428, Taiwan E-mail: fhlu{at}mail.ncku.edu.tw.

William B. Ershler, MD

Background. Hypertension was the eighth leading cause of death in Taiwan in 1996, and the prevalence of hypertension has increased recently. The purpose of the study was to assess the prevalence of hypertension and its associated cardiovascular risk factors in elderly persons in Tainan City, southern Taiwan.

Methods. The study was a cross-sectional, population-based study. We used the stratified cluster sampling method to enroll subjects aged 65 years and above, 1435 persons in total, into our study. Questionnaire interview, body weight, body height, and blood pressure measurement were completed for 876 participants (response rate of 70.2%) at each subject's home by home visit.

Results. Hypertension was defined according to the criteria of the Fifth Report of the Joint National Committee on Detection, Evaluation, and Treatment of High Blood Pressure. The crude prevalence of hypertension was 60.4% (men 59.1%, women 61.9%); previously diagnosed hypertension was 31.1% (men 29.4%, women 33.1%); and newly diagnosed hypertension was 29.3% (men 29.7%, women 28.8%). The hypertensive group had a higher body mass index (BMI) than the normotensive group. There were no lifestyle differences such as smoking, drinking, eating a vegetarian diet, reading health information, and undergoing a health examination in the past year between the hypertensive and normotensive groups. However, the hypertensive group had a higher prevalence of regular exercise than did the normal blood pressure group on univariate analysis. Only BMI and family history of hypertension had a significantly positive association with hypertension on multiple logistic regression analysis.

Conclusions. The crude prevalence of hypertension was 60.4% in elderly persons in Tainan City. Subjects who had family history of hypertension and higher BMI had a higher risk of hypertension, so they should be screened for high blood pressure regularly.

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