Mean number of chronic disease BRFs among different groups of Chinese aged 15–69 years and the independent correlates of BRFs clustering (2007 China Chronic Disease and Risk Factor Surveillance^a).

a<p>All analysis were weighted to represent the total population of national disease surveillance points system with post-stratification for age and gender.</p>b<p>Confidence intervals taking into account the complex survey design.</p>c<p>Cumulative odds ratios from a multivariate ordinal logistic regression model based on complex survey design with adjustment for all covariates. The number of the BRFs was the dependent variable.