Prediction of cardiovascular and all-cause mortality at 10 years in the hypertensive aged population

Quan Huynh, Christopher Michael Reid, Enayet Karim Chowdhury, Molla MD Rashidul Huq, Md Baki Billah, Lindon MH Wing, Andrew Maxwell Tonkin, Leon A Simons, Mark Raymond Nelson

Research output: Contribution to journalArticleResearchpeer-review

12 Citations (Scopus)

Abstract

Background We have previously developed a score for predicting cardiovascular events in the intermediate term in an elderly hypertensive population. In this study, we aimed to extend this work to predict 10-year cardiovascular and all-cause mortality in the hypertensive aged population. Methods Ten-year follow-up data of 5,378 hypertensive participants in the Second Australian National Blood Pressure study who were aged 65-84 years at baseline (1995-2001) and without prior cardiovascular events were analyzed. By using bootstrap resampling variable selection methods and comparing the Akaike and Bayesian information criterion and C-indices of the potential models, optimal and parsimonious multivariable Cox proportional hazards models were developed to predict 10-year cardiovascular and all-cause mortality. The models were validated using bootstrap validation method internally and using the Dubbo Study dataset externally. Results The final model for cardiovascular mortality included detrimental (age, smoking, diabetes, waist-hip ratio, and disadvantaged socioeconomic status) and protective factors (female sex, alcohol consumption, and physical activity). The final model for all-cause mortality also included detrimental (age, smoking, random blood glucose, and disadvantaged socioeconomic status) and protective factors (female sex, alcohol consumption, body mass index, and statin use). Blood pressure did not appear in either model in this patient group. The C-statistics for internal validation were 0.707 (cardiovascular mortality) and 0.678 (all-cause mortality), and for external validation were 0.729 (cardiovascular mortality) and 0.772 (all-cause mortality). Conclusions These algorithms allow reliable estimation of 10-year risk of cardiovascular and all-cause mortality for hypertensive aged individuals.
Original languageEnglish
Pages (from-to)649 - 656
Number of pages8
JournalAmerican Journal of Hypertension
Volume28
Issue number5
DOIs
Publication statusPublished - 2015

Cite this