title: Trends of overweight and obesity in Yi people between 1996 and 2007: an Yi migrant study.
abstract: OBJECTIVE
  To evaluate trends of overweight and obesity prevalence between 1996 and 2007 in Yi farmers and Yi migrants.
  
  
  METHODS
  An Yi migrant study was conducted in Liangshan Yi Autonomous Prefecture, Sichuan Province, China from 1996 to 2007. Data were collected with identical methods, including standardized questionnaire and body measurements.
  
  
  RESULTS
  Age- and sex-specific body mass index (BMI) significantly increased from 20.02 in 1996 to 22.36 in 2007, among Yi farmers, which was significantly different from those among Yi migrants (23.67 in 2007 and 20.90 in 1996) (P<0.05). Prevalence of obesity rose from 1.21 % in 1996 to 4.55 % in 2007 (OR=1.15, P<0.001) in Yi migrants, while that in Yi farmers from none in 1996 to 0.12 % in 2007 (P>0.05). Prevalence of overweight rose significantly to 26.24 % in 2007 from 17.24 % in 1996 (OR=1.06, P<0.001) in Yi migrants, while that in Yi farmers from 1.29 % in 1996 to 4.45 % in 2007 (OR=1.14, P>0.001). Yi migrants appeared to have a 5.52-fold higher risk on developing overweight and obesity than Yi farmers have.
  
  
  CONCLUSIONS
  The Yi migrants had a steeper increase of overweight with year and consequently caused more obesity. Change in lifestyle may contribute most likely to higher prevalence of overweight and obesity in Yi migrants.
authors: Department of Epidemiology and Statistics, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, School of Basic Medicine, Peking Union Medical College, Beijing 10005, China. guangliang_shan@hotmail.com
authors: GuangLiang
authors: G
authors: Shan
authors: DaYing
authors: D
authors: Wei
authors: ChunXiu
authors: C
authors: Wang
authors: JianHua
authors: J
authors: Zhang
authors: Bin
authors: B
authors: Wang
authors: MingJu
authors: M
authors: Ma
authors: Li
authors: L
authors: Pan
authors: Tao
authors: T
authors: Yu
authors: Fang
authors: F
authors: Xue
authors: ZhengLai
authors: Z
authors: Wu
mesh_terms: D000328:Adult; D000383:Agriculture / Q000706:statistics & numerical data / Q000639:trends*; D015992:Body Mass Index; D002681:China / Q000453:epidemiology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009765:Obesity / Q000453:epidemiology*; D050177:Overweight / Q000453:epidemiology*; D015995:Prevalence; D012424:Rural Population / Q000706:statistics & numerical data; D014171:Transients and Migrants / Q000706:statistics & numerical data*; D014505:Urban Population / Q000706:statistics & numerical data; D055815:Young Adult