The READI study follows a cohort of over 4,300 women and over 680 of their children from the state of Victoria, Australia. Women aged between 18 and 46 years were first recruited into the study following the identification of all urban and rural neighbourhoods in the state, with several neighbourhoods randomly selected and contact details for eligible women obtained from the Australian electoral roll. Following completion of the baseline survey, children were then enrolled in the cohort if participating women indicated they had a child within the eligible age range of 5 to 12 years and consented to their inclusion in the study.