Adversities of acculturation? Prevalence of obesity among immigrants
利用1990-2004年美国国民健康访问调查数据，通过合成队列方法控制年龄和时期效应，发现移民在美国居住时间越长，肥胖率越高，但这一效应因教育水平和族群而异。
I study factors associated with prevalence of obesity among immigrants as the length of their stay in the US becomes longer. Using the National Health Interview Surveys for 1990-2004, I create 'synthetic cohorts' of immigrants that allow controlling for two important determinants of obesity: age at arrival and period of arrival in the US. I find that immigrants with a BA degree did not experience any change in obesity as their stay in the US advanced. Obesity among those without a BA degree, however, increased with duration of stay. Similarly, while some ethnic groups experienced increase in obesity with duration, others did not. For those who experienced increase in obesity with duration, the rise was higher during the first five years of residence than later and greater for those who arrived at a relatively young age.