TEDS Data Dictionary

Versions of the TEDS Data Dictionary

This table shows the versions of this web, in date order, from the first version down to the current version. The table columns are the version number, the date when the system was updated with each new version, and the new pages or sections that were added.

Version numberDateAdditions to system
1.0March 2007 1st Contact study: plain and annotated booklets, returns, processing stages, derived variables, variable list.
1.1April 20071st Contact study: coding manuals, cleaning the data, verbatim text, data files.
1.29 May 20072 Year booklet study pages.
1.323 May 20073 Year booklet study pages.
1.48 June 20074 Year booklet study pages.
This versions page.
1.522 June 2007Combined (1/2/3/4) booklet dataset.
1.607 September 2007
(first main release version)
In Home study pages.
All pages restructured to include related links down the left hand side.
1.6.126 September 2007Derived variables pages restructured, with links at top of page grouped by subject/topic (instead of alphabetical list)
1.6.228 September 2007Revisions to Home page and 1st Contact main page.
1.6.31 October 2007Measures pages.
1.7.119 October 2007Pdf documents for 7 Year Study.
1.7.219 December 20077 Year Study pages.
1.811 February 20088 Year Study pages.
1.910 March 20089 Year Study pages.
1.9.19 June 2008Addition of an Introduction section to each main study page.
Modification of the 7/8/9yr data cleaning page to incorporate data cleaning for all questionnaire data from 7yr onwards.
1.1020 June 200810 Year Study pages.
1.1117 September 200812 and 14 Year initial pages: main page, measures, booklet pdfs, and 12yr returns.
1.126 October 200812 and 14 Year additions: pages describing each of the web tests
1.12.110 November 200812 and 14 Year additions: web testing summaries, and annotated pdf documents showing item coding.
1.12.228 November 200812 Year Study pages completed (additions: list of variables, derived variables, data files, data processing).
14 Year addition: derived variables page (work in progress).
General addition: summary page for data files.
1.1418 May 200914 Year Study pages brought up to date, pending collection of further data and addition of scales to the dataset.
General additions: summary pages for data entry, data cleaning, and data processing.
1.14.19 September 200914 Year Study pages brought up to date, incorporating plans to contact cohorts 2, 3 and 4.
General additions: summary pages for measures, and for booklet/questionnaire pdfs.
1.14.223 September 2009 General additions: summary pages for study samples and data returns, and a glossary.
1.14.324 September 2010 14 Year Study pages brought up to date, including descriptions of wave 2 data collection.
General addition: summary pages for spin-off studies, and for data files.
1.16.121 March 201116 Year Study initial pages: main page, measures, initial returns, web study activity pages, GCSE questionnaire, behaviour study questionnaires.
Numerous code errors corrected.
Returns pages modified from 7 Year and later studies, to show returns by study cohort rather than by twin birth year.
1.16.218 July 2011Further 16 Year Study pages: list of variables, derived variables, data files, processing stages, data cleaning.
Refinement and updating of earlier 16 Year pages.
Updates to general pages, to add references to the 16 Year study and links to the 16 Year pages.
1.16.319 October 2011Refinement and updating of earlier 16 Year pages, particularly with reference to new variables for GCSE/exam results.
New 16 Year Study page: exam results collection page.
New general page describing TEDS DNA collection studies.
1.16.44 April 2012Refinement and updating of earlier 16 Year pages, particularly with reference to the LEAP booklet study (with new pdfs).
1.18.114 September 2012Addition of 18 Year study pages (many of them in an incomplete state).
Updating of existing 16 Year pages with reference to the new LEAP-2 booklet study.
1.18.211 March 2013Updates to 18 Year study pages.
Updates to 1st Contact and 2 Year study pages, to reflect changes in the new versions of the 1st Contact and 2 Year datasets.
1.18.313 January 2014 Updates to 3 Year and 4 Year study pages, to reflect changes in the new version of the 3 Year and 4 Year datasets.
Removal of the Combined Booklet Dataset pages (this dataset is now redundant).
Modification of pages describing the zygosity algorithm and scrambling of IDs.
Minor updates to 16 Year and 18 Year study pages
1.18.414 April 2014 Addition of the Perception Study to the 18 Year Study pages.
Addition of page describing representativeness of study samples.
Addition of documents to the spin-off studies page.
Updates to 7 Year study pages reflecting changes to the dataset.
1.18.4.17 May 2014 Updates to 8 and 9 Year study pages reflecting changes to the dataset.
1.18.4.218 June 2014 Updates to 10 Year study pages reflecting changes to the dataset.
1.18.4.31 October 2014 Updates to 12 Year study pages reflecting changes to the dataset.
1.18.54 June 2015 Updates to 18 Year study pages, including addition of the Bricks and FFMP web studies.
1.18.5.123 September 2015 Updates to 18 Year study pages, including addition of the Kings Challenge web study.
1.18.5.22 December 2015 Addition of web data cleaning page, and numerous minor revisions to other pages.
1.18.5.318 January 2016 Updates to 18 Year returns.
Updates to 16 Year study pages reflecting changes to the dataset.
1.18.63 January 2017 Updates to In Home study pages reflecting changes to the dataset.
Expansion of detail in the 'sample selection' part of the 1st Contact page.
Minor updates to various 18 Year pages.
1.2118 September 2017 Initial pages added for the TEDS 21 study.
1.21.116 July 2018 More details added for the TEDS 21 study, including the phase 2 questionnaire.
1.21.217 December 2018 New "exclusions" page, and new versions of exclusion variables.
Minor updates for the TEDS 21 study.
1.21.318 January 2019 New version of longitudinal "measures" page.
Minor updates for the TEDS 21 study.
1.21.49 August 2019 New "polygenic scores" page.
1.21.515 January 2020 New page describing "background variables"; standardisation of all background variables across different datasets.
Additions to 21 Year study derived variables and measures pages.
1.21.625 August 2020 New pages describing the g-game and covid studies (phases 1 and 2) incorporated within the 21 Year section, with associated updates to the 21 Year study derived variables and measures pages.
Modified, adaptive layout introduced in most pages to improve formatting when viewed on mobile devices.
1.21.76 November 2020 New pages describing phase 3 of the covid study incorporated within the 21 Year section. Updates to various 21 Year study pages (measures, derived variables, variable list and others) relating to the covid and g-game studies.