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 Surveillancea).

aAll analysis were weighted to represent the total population of national disease surveillance points system with post-stratification for age and gender.bConfidence intervals taking into account the complex survey design.cCumulative 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.