Secular trends of population attributable risk of overweight and obesity for hypertension among Chinese adults from 1991 to 2011

We determined if the increasing trend in hypertension can be partly attributed to increasing prevalence of overweight/obesity in China over the past two decades. Data were collected from 1991 to 2011 and the population attributable risk (PAR), which is used to estimate the intervention effect on hypertension if overweight/obese, were eliminated. Linear regression was used to evaluate the secular trends. The age-standardized prevalence of overweight and obesity increased by 26.32% with an overall slope of 1.27% (95% CI: 1.12-1.43%) per year. Hypertension also increased by 12.37% with an overall slope of 0.65% (95% CI: 0.51-0.79%) per year. The adjusted ORs of overweight/obesity for hypertension across the survey years remained unchanged; however, the trend in PAR increased steadily from 27.1 to 44.6% with an overall slope of 0.81% (95% CI: 0.34-1.28%) per year (P=0.006). There was no significant gender difference in the slopes of increasing PAR, as measured by regression coefficients (beta =0.95% vs. beta =0.63% per year, P=0.36). Over the past two decades, the increase in the prevalence of hypertension in China was partly attributed to the overweight/obesity epidemic, which highlights the importance of controlling weight and further reducing the burden of hypertension.