title: Family average income and body mass index above the healthy weight range among urban and rural residents in regional Mainland China.
abstract: OBJECTIVE
  To explore the relationship between family average income (FAI; an index of socio-economic status) and body mass index (BMI; a widely used, inexpensive indicator of weight status) above the healthy weight range in a region of Mainland China.
  
  
  METHODS
  Population-based cross-sectional study, conducted between October 1999 and March 2000 on a sample of regular local residents aged 35 years or older who were selected by random cluster sampling.
  
  
  METHODS
  Forty-five administrative villages selected from three urban districts and two rural counties of Nanjing municipality, Mainland China, with a regional population of 5.6 million.
  
  
  METHODS
  In total, 29,340 subjects participated; 67.7% from urban and 32.3% from rural areas; 49.8% male and 50.2% female. The response rate among eligible participants was 90.1%.
  
  
  RESULTS
  The proportion of participants classified as overweight was 30.5%, while 7.8% were identified as obese. After adjusting for possible confounding variables (age, gender, area of residence, educational level, occupational and leisure-time physical activity, daily vegetable consumption and frequency of red meat intake), urban participants were more likely to be overweight or obese relative to their rural counterparts, more women than men were obese, and participants in the lowest FAI tertile were the least likely to be above the healthy weight range.
  
  
  CONCLUSIONS
  The proportion of adults with BMI above the healthy weight range was positively related to having a higher socio-economic status (indexed by FAI) in a regional Chinese population.
authors.affiliation: Nanjing Municipal Center for Disease Control & Prevention, 2 Zizhulin, Nanjing 210003, People's Republic of China. f_xufei@hotmail.com
authors.forename: Fei
authors.initials: F
authors.lastname: Xu
authors.forename: Xiao-Mei
authors.initials: XM
authors.lastname: Yin
authors.forename: Min
authors.initials: M
authors.lastname: Zhang
authors.forename: Eva
authors.initials: E
authors.lastname: Leslie
authors.forename: Robert
authors.initials: R
authors.lastname: Ware
authors.forename: Neville
authors.initials: N
authors.lastname: Owen
mesh_terms: D000328:Adult; D000368:Aged; D015992:Body Mass Index; D002681:China / Q000453:epidemiology; D016000:Cluster Analysis; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D007182:Income; D008297:Male; D008875:Middle Aged; D009765:Obesity / Q000453:epidemiology*; D016017:Odds Ratio; D015995:Prevalence; D012424:Rural Population / Q000706:statistics & numerical data*; D012737:Sex Factors; D012923:Social Class; D012959:Socioeconomic Factors; D014505:Urban Population / Q000706:statistics & numerical data*