have published evidence that half-a-lifetime of research participation has not improved Study members’ mental or physical health as compared to same-aged participants in the New Zealand National Health and Nutrition Survey’s (e.g. BMI, smoking, visits to the doctor) [10]. Day-long assessments (called phases) have been conducted at ages 3, 5, 7, 9, 11, 13, 15, 18, 21, 26, 32, and most recently at age 38 years (in 2010–2012) when 95 % of the living Study members took part. Our next assessment, at age 45, will begin in 2017.
