This project is an extension of the longitudinal study under the leadership of the University of Otago, with the cultural dimensions of the study coordinated by the University of Canterbury. (2011-2015). The Christchurch Health and Development Study is a longitudinal study of a birth cohort of 1,265 children born in the Christchurch urban region during mid-1977. The cohort was obtained by contacting the mothers of all live-born children giving birth in all maternity units, both public and private, in the Christchurch urban region during a four-month period and enlisting their participation in the research. Of the 1,310 mothers giving birth at this period, 1,265 (98%) agreed to participate in the research. It is an acclaimed study of international renown.