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CLINICAL RESEARCH: OBESITY AND HEART DISEASE

Measures of Obesity and Cardiovascular Risk Among Men and Women

Rebecca P. Gelber, MD, DrPH^_*,_**, J. Michael Gaziano, MD, MPH^_*,,¶, E. John Orav, PhD^,||, JoAnn E. Manson, MD, DrPH^,, Julie E. Buring, ScD^_*,,,# and Tobias Kurth, MD, ScD^_*,,,_*

^_* Division of Aging, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
Division of Preventive Medicine, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
Division of General Medicine and Primary Care, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
Department of Epidemiology, Harvard School of Public Health, Boston, Massachusetts
^|| Department of Biostatistics, Harvard School of Public Health, Boston, Massachusetts
^¶ Massachusetts Veterans Epidemiology Research and Information Center, VA Boston Healthcare System, Harvard Medical School, Boston, Massachusetts
^# Department of Ambulatory Care and Prevention, Harvard Medical School, Boston, Massachusetts
^_** Harvard Vanguard Medical Associates, Boston, Massachusetts.

Manuscript received November 16, 2007; revised manuscript received February 19, 2008, accepted March 4, 2008.

^_* Reprint requests and correspondence: Dr. Tobias Kurth, Brigham and Women's Hospital, Division of Aging, 1620 Tremont Street, Boston, Massachusetts 02120. (Email: tkurth{at}rics.bwh.harvard.edu).

Objectives: This study examined associations between anthropometric measures (body mass index, waist circumference, waist-to-hip ratio, waist-to-height ratio [WHtR]) and risk of incident cardiovascular disease (CVD) (including nonfatal myocardial infarction, nonfatal ischemic stroke, and cardiovascular death).

Background: Controversy exists regarding the optimal approach to measure adiposity, and the utility of body mass index has been questioned.

Methods: Participants included 16,332 men in the Physicians' Health Study (mean age 61 years in 1991) and 32,700 women in the Women's Health Study (mean age 61 years in 1999). We used Cox proportional hazards models to determine relative risks and 95% confidence intervals (CIs) for developing CVD according to self-reported anthropometric indexes.

Results: A total of 1,505 CVD cases occurred in men and 414 occurred in women (median follow-up 14.2 and 5.5 years, respectively). Although WHtR demonstrated statistically the strongest associations with CVD and best model fit, CVD risk increased linearly and significantly with higher levels of all indexes. Adjusting for confounders, the relative risk for CVD was 0.58 (95% CI: 0.32 to 1.05) for men with the lowest WHtR (<0.45) and 2.36 (95% CI: 1.61 to 3.47) for the highest WHtR (0.69; vs. WHtR 0.49 to <0.53). Among women, the relative risk was 0.65 (95% CI: 0.33 to 1.31) for those with the lowest WHtR (<0.42) and 2.33 (95% CI: 1.66 to 3.28) for the highest WHtR (0.68; vs. WHtR 0.47 to <0.52).

Conclusions: The WHtR demonstrated statistically the best model fit and strongest associations with CVD. However, compared with body mass index, differences in cardiovascular risk assessment using other indexes were small and likely not clinically consequential. Our findings emphasize that higher levels of adiposity, however measured, confer increased risk of CVD.

Key Words: obesity • cardiovascular disease • epidemiology

Abbreviations and Acronyms   BMI = body mass index   BP = blood pressure   CI = confidence interval   CVD = cardiovascular disease   LRT = likelihood ratio test   RR = relative risk   WC = waist circumference   WHR = waist-to-hip ratio   WHtR = waist-to-height ratio

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				G. T. Lesser Problems in measurement of body "fatness". J. Am. Coll. Cardiol., February 10, 2009; 53(6): 526 - 527. [Full Text] [PDF]

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				S. E. Litwin Which Measures of Obesity Best Predict Cardiovascular Risk? J. Am. Coll. Cardiol., August 19, 2008; 52(8): 616 - 619. [Full Text] [PDF]