A new UC Irvine-led study indicates that growing up in an unpredictable environment, where daily life lacks consistency, is strongly associated with various mental health challenges in children.
The findings, published in Nature Mental Health, are based on nearly 30,000 children receiving care through Rady Children’s Health pediatric clinics in Orange County. Researchers found that this less visible form of adversity is linked to depression, anxiety, sleep disorders, and other mental health concerns.
For years, pediatricians have used a checklist to identify children exposed to traumatic events like abuse or neglect. The UC Irvine-led study suggests that simply asking a few questions about unpredictability can identify many at-risk young people who would not have been recognized through traditional Adverse Childhood Experiences (ACEs) screenings alone.
This work translates years of neuroscience research into a practical tool. Dr. Tallie Z. Baram, UC Irvine Donald Bren Professor and Distinguished Professor of pediatrics, neurology, and anatomy and neurobiology, has studied how early-life experiences influence brain development. Her laboratory research revealed that developing brains rely on predictable patterns for healthy neural connections. Dr. Baram, the study’s senior and co-corresponding author, stated, “optimal development of the brain depends on consistent patterns.”
The new study evaluated whether adding a five-question measure of childhood unpredictability could improve screening. Both traditional adversity and unpredictability were linked to higher rates of depression, anxiety, behavioral concerns, sleep disorders, and physical symptoms. Notably, children with highly unpredictable lives, even without traditional ACEs, were substantially more likely to experience depression. Combining both screening methods often yielded stronger links to mental health outcomes.
Dr. Laura M. Glynn, professor of psychology at Chapman University and co-corresponding author, noted that unpredictability is a “distinct and meaningful form of adversity” that existing tools miss. The study, funded by a $2.9 million grant from the California Initiative to Advance Precision Medicine, incorporated the questionnaire into routine pediatric visits at 19 Rady-affiliated clinics in Orange County between 2021 and 2024. This project, involving researchers from UC Irvine, Chapman University, and Rady Children’s Health, represents one of the largest real-world studies on how different forms of adversity affect children’s mental health.
Unlike some forms of adversity, unpredictability can often be influenced by families and communities. Consistent routines, reliable caregiving, and stable daily patterns may support healthy brain development. Dr. Baram emphasizes that this is not about perfection for parents, but about recognizing that consistency matters. Measuring unpredictability could become an important addition to routine care, offering families another way to support healthy development during critical growth years.
