Study on the secular changes of BMI, prevalence rates of overweight, obesity and related factors in an urban elderly population, Beijing from 2001 to 2010 / 中华流行病学杂志

ABSTRACT

<p><b>OBJECTIVE</b>The aim of this study was to assess the secular changes of BMI, prevalence rates of overweight and obesity as well as related factors in an elderly population of Beijing, during 2001 and 2010.</p><p><b>METHODS</b>A two-round population-based cross-sectional study was conducted in an elderly population, selected from a representative urban area in Beijing in 2001 (n = 2 277) and 2010 (n = 2 102) respectively.</p><p><b>RESULTS</b>In this population, the age-adjusted means on BMI were 25.3 (95%CI, 25.1-25.5) for men and 25.8 (95%CI, 25.5-25.9) for women in 2001, and 25.0 (95%CI, 24.8-25.1) and 25.0 (95%CI, 24.7-25.1) in 2010, respectively, which all significantly declined. According to the WHO criteria, related data were shown as followsthe age standardized prevalence rates of overweight (BMI ≥ 25 kg/m²) were 48.3% among men and 46.3% among women in 2001, 44.5% and 39.9% for men and women in 2010 respectively; the age-standardized prevalence rates of obesity (BMI ≥ 30 kg/m²)were 5.4% on men and 11.6% on women in 2001, but declined to 4.9% and 7.3% in 2010 respectively; the prevalence rates of overweight and obesity were both significantly declined in women, but not in men. However, according to WGOC criteria, the age standardized prevalence rates on overweight (BMI ≥ 24 kg/m²) were 47.9% in men and 44.9% in women in 2001, and were 47.2% and 41.0% respectively for men and women in 2010; the age-standardized prevalence rates of obesity (BMI ≥ 28 kg/m²) were 19.2% in men and 24.2% in women in 2001, both significantly declined to 15.5% and 18.0% in 2010, respectively. Positive correlations were found between the levels of blood pressure, glucose and lipids and BMI. Results from multiple factors logistic regression analysis also indicated that healthy lifestyle including reducing cigarette smoking, alcohol drinking and increasing daily exercises in the last 10 years, also played roles in the decrease of prevalence rates on both overweight and obesity.</p><p><b>CONCLUSION</b>The mean BMI and prevalence rates of overweight and obesity decreased in the last 10-year period, 2001-2010. Hypertension, hyperglycemia and hyperlipidemia remained as risk factors of overweight and obesity. Healthy lifestyle in elderly seemed partially account for the declined BMI.</p>