The Dunedin Study - DMHDRU

The Assessments

The first assessment (or "Phase") following the Study members' birth in 1972-73 was undertaken when they were aged 3 years. Since then, there have been assessments at ages 5, 7, 9, 11, 13, 15, 18, 21, 26, 32 and at 38 years. The age 45 assessment is currently underway. For the earlier phases, assessments normally occurred within six weeks of the Study member’s birthday. For the more recent phases, however, assessments normally occurred within 9 months of the Study member’s birthday.

During an "assessment phase", our Study members come back to the Dunedin Research Unit for a one-day assessment from wherever in the world they are living - an impressive exercise considering that approximately 25% currently reside overseas, including in the UK, Europe, Asia, Middle East, US and Canada. Once in Dunedin, almost all aspects of their physical and mental health are examined - this includes cardiovascular, dental, respiratory, sexual and mental health, psychosocial well-being, and detailed interviews about relationships, behaviour and family.

The table below shows the number of Study members who participated at each assessment. 

* Surviving Study members from the foundation cohort

Year Phase Age No. eligible No. assessed % assessed
1972-73 0 Birth      
1975-76 III 3   1037 100
1977-78 V 5 1037* 991 96
1979-80 VII 7 1035* 954 92
1981-82 IX 9 1035* 955 92
1983-84 XI 11 1033* 925 90
1985-86 XIII 13 1031* 850 82
1987-88 XV 15 1029* 976 95
1990-91 XVIII 18 1027* 993 97
1993-94 XXI 21 1020* 992 97
1998-99 XXVI 26 1019* 980 96
2003-05 XXXII 32 1015* 972 96
2010-12 XXXVIII 38 1007* 961 95
2017-18 XXXXV 45 999* ? ?