RT Journal Article SR Electronic T1 Intimate partner violence against women and child maltreatment in a Brazilian birth cohort study: co-occurrence and shared risk factors JF BMJ Global Health JO BMJ Global Health FD BMJ Publishing Group Ltd SP e004306 DO 10.1136/bmjgh-2020-004306 VO 6 IS 4 A1 Romina Buffarini A1 Carolina V N Coll A1 Terrie Moffitt A1 Mariângela Freitas da Silveira A1 Fernando Barros A1 Joseph Murray YR 2021 UL http://gh.bmj.com/content/6/4/e004306.abstract AB Background Intimate partner violence (IPV) against women and child maltreatment (CM) are major public health problems and human rights issues and may have shared causes. However, their overlap is understudied. We investigated the prevalence of IPV and CM, their co-occurrence in households and possible shared risk factors, in the general population of a Brazilian urban setting.Methods Prospective population-based birth cohort, including over 3500 mother–child dyads with maternal reports on both IPV and CM when children were 4 years old. Eleven neighbourhood, family and parental risk factors were measured between birth and age 4 years. Bivariate and multivariate Poisson regression models with robust variance were used to test which potential risk factors were associated with IPV, CM and their co-occurrence.Results The prevalence of any IPV and CM were 22.8% and 10.9%, respectively; the co-occurrence of both types of violence was 5%. Multivariate analyses showed that the overlap of IPV and CM was strongly associated with neighbourhood violence, absence of the child’s biological father, paternal antisocial behaviour in general and a mother–partner relationship characterised by high levels of criticism, maternal depression and younger maternal age. A concentration of many risk factors among 10% of the population was associated with a sixfold increase in risk for overlapping IPV and CM compared with households with no risk factors.Conclusion IPV and CM share important risk factors in the family and neighbourhood environments and are particularly common in households with multiple social disadvantages and family difficulties. Integrated preventive interventions are needed.Data are available upon request. Due to confidentiality restrictions related to the ethics approval for this study, no identifying information about participants may be released. Dataset without identification used during the current study is available from the corresponding author on reasonable request.