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From the Institute for Clinical Evaluative Sciences (Tu, Chen, Lipscombe); and the Departments of Family and Community Medicine (Tu) and Medicine (Lipscombe), University of Toronto, Toronto, Ont.
Correspondence to: Dr. Karen Tu, Institute for Clinical Evaluative Sciences, Rm. G108, 2075 Bayview Ave., Toronto ON M4N 3M5; fax 416 480-6048; karen.tu{at}ices.on.ca
Background: We have reported that the prevalence of diagnosed hypertension increased by 60% from 1995 to 2005 in Ontario. In the present study, we asked whether this increase is explained by a decrease in the mortality rate.
Methods: We performed a population-based cohort study using linked administrative data for Ontario, a Canadian province with over 12 million residents. We identified prevalent cases of hypertension using a validated case-definition algorithm for hypertension, and we examined trends in mortality from 1995 to 2005 among adults aged 20 years and older with hypertension.
Results: The age- and sex-adjusted mortality among patients with hypertension decreased from 11.3 per 1000 people in 1995 to 9.6 per 1000 in 2005 (p < 0.001), which is a relative reduction of 15.5%. We found that the relative decrease in age-adjusted mortality was higher among men than among women (–22.2% v. –7.3%, p < 0.001).
Interpretation: Mortality rates among patients with hypertension have decreased. Along with an increasing incidence, decreased mortality rates may contribute to the increased prevalence of diagnosed hypertension. Sex-related discrepancies in the reduction of mortality warrant further investigation.
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