The population consists of any resulting child from all pregnant women resident in the old administrative county of Avon if their estimated delivery date fell between 1 April 1991 and 31 December 1992.
Sources of Recruitment
|Territory||Old administrative county of Avon, South West England.|
|Number of participants||
|Number of participants with biosamples||
|Supplementary information about number of participants||
14062 G1 children were recruited in phase 1, this has been increased in three subsequent phases.