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, most recently, at 38 years (Phases 3 to 38 respectively). 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 more than 40 of them now live in the UK/Europe and a futher 25 in 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. Please click on a number in the phase column to view the data collected, Principal Researchers involved at that assessment, and directories of the data collected/research forms administered.

a - Number resident in Greater Dunedin Metropolitan Area
b - 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 1037b 991 96
1979-80 VII 7 1035b 954 92
1981-82 IX 9 1035b 955 92
1983-84 XI 11 1033b 925 90
1985-86 XIII 13 1031b 850 82
1987-88 XV 15 1029b 976 95
1990-91 XVIII 18 1027b 993 97
1993-94 XXI 21 1020b 992 97
1998-99 XXVI 26 1019b 980 96
2003-05 XXXII 32 1015b 972 96
2010-12 XXXVIII 38 1007b 961 95