8 Year Data Returns
This page summarises data returns in the 8 Year parent questionnaire study.
Most of the figures in the tables below are based on information logged in
the TEDS admin database. However, figures for 'data in the dataset' are based on
the final analysis dataset itself. Discrepancies between returns and actual data
arise because of logging errors, unusable data, and losses of data.
Note that, at the time of this study, attempts were made to collect data from all
apparently contactable families in the original ONS sample. This included inactive
families (never returned data and never enrolled) who were later removed from
the TEDS sample - see the 1st Contact page.
All parents who returned the 8 Year questionnaire were active and
therefore have remained part of the TEDS sample. The return rates
are therefore calculated as a percentage of the current TEDS sample,
making these returns comparable with those in later studies.
The figures shown in the table below are numbers of families (twin pairs).