Relative age as a risk factor for psychiatric diagnoses in children born preterm and to term: a cohort study | BMJ Paediatrics Open
Objective To assess relative age effects (how the youngest children in a school class are at increased risk compared with their older classmates) on healthcare use with psychiatric diagnoses in childhood and adolescence within preterm and term-born boys and girls.Design/setting/patients Registry-based cohort study including individuals born in Norway from 1991 to 2012 with follow-up data from the National Patient Registry from 2008 to 2017 when they were aged between 4 and 18 years.Exposures ...| BMJ Paediatrics Open
