Abstract
Background: Studies have shown an association between parental problematic substance use (PSU) and children's out-of-home care (OHC). But there is little researech on the kind of urban neighbourhoods in which such associations typically show up. This study aims to shed light on the associations between neighbourhood characteristics, parental PSU and children's OHC. Using register data, we explore the spatial concentration of parental PSU and children's OHC in urban areas. Methods: Register data of all children born in Finland in 2002 and their biological parents living in 14 Finnish cities were used to follow the children from birth until their 18th birthday or first OHC episode. The study looks at parental PSU andother individual-level indicators as well-as the sociodemographic neighbourhood characteristics. Cox proportional hazards modelling was used as the analysis method. Results: Parental PSU increased the probability of children's OHC regardless of neighbourhood type. The probabilty was highest if both parents had PSU (hazard ratio [HR] = 8.05, 95% confidence interval [Cl] 6.38-10.16), but this outcome did not look the same for all neighbourhoods. The risk of children's OHC placements was higher in suburbs compared to city centres (HR = 1.76, 95% Cl 1.38-2.25). Conclusion: As parental substance use is a complex problem that is often intertwined with other life challenges, such as financial difficulties and mental health problems, it is insufficient to treat caregiver conditions, such as problematic substance use in isolation. Services that increase positive, pro-social connections may be lacking in the neighbourhoods with the most challenges.