The KoGES Immigrant Study was launched to assess the impact of environmental and lifestyle changes resulting from immigration, and to investigate risk factors for disease occurrence due to these changes. Baseline recruitment included immigrant women from Vietnam, their Korean spouses, and children. Women who had been in Korea for more than 6 months were contacted in 31 cities and counties nationwide. Over 6,700 participants, including 2,875 immigrant women, 1,911 Korean spouses, and 1,923 children, were recruited at baseline from 2006 to 2011. The first phase of follow-up was conducted from 2012 to 2014 for only immigrants and children.