Childhood maltreatment has been consistently associated with poor health outcomes, such as obesity, cardiovascular health, mental health, substance misuse and risky sexual behaviours. There is no gold standard to assess childhood maltreatment, and both prospective and retrospective reports entail potential limitations. A poor agreement has been shown between measures of childhood maltreatment assessed prospectively (usually through parental report and official records) and retrospectively (often self-reported), suggesting that these forms of report of maltreatment identify different groups of individuals. The use of retrospective measures of childhood maltreatment might overestimate the associations with subjectively measured outcomes (e.g. self-reported, such as health behaviours and mental health) and underestimate the associations with objectively measured outcomes (e.g. physical health). However, few studies have information on both prospective and retrospective measures of childhood maltreatment and were able to compared the associations of different types of reports of maltreatment with subjectively and objectively measured health outcomes. This project aims to assess and compare associations of prospectively and retrospectively reported childhood maltreatment with key subjectively and objectively measured health outcomes in early adulthood (e.g. cardiovascular risk factors, mental health, and socioeconomic status).