Collected Dataset / ALSPAC_Children_38months

The population consists of any resulting child from all pregnant women residents in the old administrative county of Avon if their estimated delivery date fell between 1 April 1991 and 31 December 1992.

Information was collected through the use of questionnaires, and registries.

Some questions were child based and some were child completed. Questionnaire specifically collected information about health and behaviour and how child gets along with other children. In addition, information was collected about physical health, mental and cognitive issues, diet and nutrition, environmental characteristics, parenting, childcare and schooling, , substance use, activities and other characteristics. Information about accidents and injuries, medications, hearing, vision, speech problems, other health problems, toilet training, and teeth/dental problems, diet and nutrition information including food frequency, feeding difficulties, eating behaviours, dietary supplements and alcohol use was collected, as well as information about activities such as tv viewing, indoor/outdoor activities, pacifier use and thumb sucking . Anthropometry measures were collected in a self-reported manner. Environmental exposures information such as passive smoke, contact with pets and hygiene and information about parenting, childcare and schooling information such as who, where and when children are cared for was also collected.

Amongst mental and cognitive issues information about temperament, language/vocabulary, and communication was collected.

Children have been linked to the Clinical Practice Research Datalink (CPRD) database, Pupil Level Annual School Census (PLASC), Annual School Census (ASC) and National and the Pupil Database (NPD).

Participants were linked to residential addresses across the life course. Linkages could be established to co-ordinates or health, political and administrative geographies. Participants could also be linked to neighbourhood data.