A study that tracked psychopathology in 13,000 children and adolescents found that
Investigators also found a strong correlation between new incidence of high psychopathology and externalizing problems such as hyperactivity. “It is of paramount importance to identify factors that distinguish those with persisting problems and escalating trajectories so that resources can be appropriately directed,” wrote the authors of the study published online in JAMA Network Open.
Recent studies have shown that concurrent and sequential comorbidity of psychiatric disorders are very common in adult populations, lead author Colm Healy, PhD, a postdoctoral researcher for psychiatry with the University of Medicine and Health Sciences, Ireland, said in an interview.
The speculation is that this occurs in early life when psychiatry symptoms experience high fluidity. “This presents a complex scenario to model, where young people’s mental health appears to shift and change across development. Few investigations to date have had the data available to examine these trajectories over the full range of child development,” said Dr. Healy.
He and his colleagues attempted to map the profiles and trajectories of psychopathology in children and adolescents, using latent profile transition analysis (LPTA), a person-centered method, to assess comorbidity and movement in the various phases of childhood development.
“The idea behind person-centered methods such as LTPA is that it identifies unobserved subgroups of participants who respond similarly to specific variables – in this case responses to a broad measure of psychopathology,” explained Dr. Healy.
The study included 7,507 children from the child sample (ages 3, 5, and 9 years) and 6,039 children from the adolescent sample (ages 9, 13, and 17 or 18 years). Data analysis took place from October 2020 to September 2021.
Dr. Healy and colleagues in a supplementary investigation compared cohorts at age 9 years to look for sex and generational differences.
Four developmental profiles
Researchers identified 4 distinct developmental profies for person-centered psychopathological trajectories: no psychopathology (incidence range, 60%-70%), high psychopathology (incidence range, 3%-5%), externalizing problems (incidence range, 15%-25%), and internalizing problems (incidence range, 7%-12%).
Internalizing problems reflect issues with peers and emotional problems whereas externalizing problems more closely associate with hyperactivity and conduct.
Less than 5% of the youth studied experienced persistent symptoms. However, 48.6% in the child cohort and 44.1% in the adolescent cohort moved into one of the 3 psychopathology profiles (high psychopathology, externalizing, internalizing problems) at some point in development.
The spread of trajectories was more diverse in the child cohort, said Dr. Healy. “Children ebbed and flowed between the different profiles over time with a large proportion falling into one of the psychopathology categories and then switching between these profiles.” Switching was also evident in the adolescent cohort but to a lesser extent, he said.
Externalizing problems link to high psychopathology
Rates of remittance were higher among individuals in both cohorts for internalizing problems, compared with externalizing problems.
It’s possible that for some of these young people, internalizing problems are a reaction to environmental stressors such as bullying,” said Dr. Healy. “When that stress is relieved, the internalizing problems may dissipate.”
In a clinically relevant finding, children with externalizing problems (age 5, 129 [61.3%] and age 9, 95 [74.3%]) were more likely to present with new incidents of high psychopathology. This was also true in the adolescent group (age 13, 129 [91.1%] and age 17, 146 [89.9%]).
This suggests that a proportion of youth with externalizing problems have an escalating trajectory of psychopathology. “Thus, it may be possible to distinguish those with an escalating trajectory from a stable or remitting trajectory. The specific distinguishing factors require further investigation, but it has been observed before that some of those reporting externalizing problems in early life continue to have difficulties into later life,” noted Dr. Healy.
A combination of environmental or biological factors may explain this escalation, which could respond to early intervention, he said.
Overall, few children in the study transitioned directly from no psychopathology to high psychopathology.