Abstract 12691: Central Obesity is a Risk Factor for Hypertension Independent of Body Mass Index in Elderly Individuals: Results of a Population-Based Study
Identification of risk factors for hypertension is demanded in elderly individuals in face of its higher prevalence at this age. The risks of central obesity were scarcely studied in this group, particularly regarding its independence of overall obesity.
We tested the hypothesis that central obesity predicts hypertension within body mass index categories, independently of confounding factors among the elderly population from a city in Southern Brazil.
This is a cross-sectional study of 599 subjects aged 60 to 90 years-old, randomly selected from the city population. Certified interviewers carried out the data collection and anthropometric measurements. Blood pressure (BP) was measured four times during the interview using a validated oscillometric monitor. Hypertension was diagnosed by blood pressure ≥140/90 mmHg or use of BP-lowering drugs. Central obesity was determined by waist circumference ≥102 (men) or 88 (women) cm, and body mass index (BMI; ≥25 kg/m2) identified individuals with overweight. A sample size of 380 subjects would provide 80% power to detect an association with 95%CI, assuming a prevalence of 60% (no central obesity) and 74% (central obesity). Modified Poisson Regression was used for multivariate analysis, and risk ratios (95%CI) were calculated controlling for confounding. The study was approved by the Ethics Committee of our Institution, and all patients signed a written informed consent for participation.
The elderly participants were aged 70.7 (±7.2) years, 68.8% were women, 70.1% had hypertension, 52.7% had central obesity, and 72.3% had overweight. Central obesity was associated with hypertension independently of BMI, age and education. Elderly who were not overweighed had a prevalence of hypertension 33% higher in the presence of central obesity (RR=1.33; 95%CI: 1.04-1.70; P = 0.02). For participants with overweight, the prevalence of hypertension in participants in with central obesity was 18% higher than in individuals without central obesity (RR=1.18; 95%CI:1.02-1.36; P = 0.03).
In conclusion, central obesity is an independent predictor of hypertension in both, lean and overweighed elderly individuals.
- © 2011 by American Heart Association, Inc.