The study is based on a survey carried out in December 1962 of all Aberdeen primary school children born between 1950-56. These children took standardised reading tests and provided information about parental occupation and number of siblings. Information was obtained from school records that included standard school tests at age 7, 9 and 11 years, and from school health records on height and weight. Information about maternal characteristics (including height and age), course of pregnancy and birth details including birth weight and gestational age was taken from the Aberdeen Maternity and Neonatal Databank.
In the late 1990s the value of this information was realised and the research team attempted to follow up the original participants. The whereabouts of 98.5% of 12150 of those who took part were traced, with 81% still living in Scotland and 73% in Grampian. A postal questionnaire was sent to over 11,000 of those participants who could still be contacted, with a response rate of 63%. Since then the research team have also carried out anonymised linkages to routinely collected medical records from the Scottish Morbidity Records System.
The summary of the results is available on the project's website.
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