Parent Follow-up

This study will survey the surviving TAHS parents and collect a sample of blood for DNA from the parents whose children have already attended the labs. This study is highly cost effective since we have already investigated the nuclear family members of the TAHS cohort. Only a small amount of additional information from the parents of the TAHS is needed to expand the study to a full family dataset. We will use sophisticated statistical methods to analyse the family data of this unique longitudinal study to investigate the effects of genetic factors and their interaction with environmental factors on the lifetime risk of allergies.