The study, carried out by Ikechukwu Frank Ogbonna of the Department of Pediatrics at the Federal Medical Centre, Umuahia, in Abia State, set out to answer a deceptively simple question: does the effect of worsening asthma severity on a child’s mental health depend on how well the asthma is controlled? Clinical guidelines, including those of the Global Initiative for Asthma, treat severity and control as related but distinct dimensions of the disease. Severity reflects the intrinsic intensity of the condition, while control describes how well symptoms and exacerbations are managed over time. The researchers hypothesized that these two dimensions might interact, jointly amplifying psychological risk in ways that neither alone could fully explain.

To test that hypothesis, the team conducted a cross-sectional analytical survey involving 101 children with asthma aged between 6 and 17 years, recruited from the hospital’s pediatric asthma clinic, alongside 101 age- and sex-matched controls drawn from the surrounding community. Matching the comparison group by age and sex was a deliberate methodological choice, since both variables are known to influence mental health scores in childhood and could otherwise confound the analysis. Mental health status in both groups was assessed using the Strengths and Difficulties Questionnaire, a widely validated screening instrument that generates a total difficulty score across emotional, conduct, hyperactivity, peer-relationship and prosocial domains.

Among the children with asthma, disease severity was classified using the Asthma Severity Scale, while the degree of symptom control was measured with the Asthma Control Test, a patient-reported instrument that captures daytime symptoms, nighttime awakenings, activity limitation and rescue medication use. The study’s central hypothesis was tested at a significance threshold of P less than 0.05, and the interaction between severity and control was examined using a multivariate logistic regression model, a statistical technique that allows researchers to estimate the independent contribution of each factor while holding the other constant.

The first and most striking result was that children with asthma scored significantly worse on mental health screening than their peers. The median total difficulty score of the asthma group was significantly higher than that of the matched controls, with a P value of 0.001. In practical terms, this means that even before any analysis of severity or control, the children attending the asthma clinic were already carrying a measurably heavier psychological burden than children of the same age and sex without the disease—a pattern consistent with a growing international literature linking chronic childhood illness to emotional and behavioral difficulties.

When the researchers turned to the interaction question, however, the answer was negative. There were no significant interaction effects of asthma severity and control on the mental health of the children with asthma. In the adjusted model, the relationship between mental health problems and asthma severity did not reach statistical significance, yielding an adjusted odds ratio of 8.13 with a 95 percent confidence interval of 0.85 to 101.17 and a P value of 0.10. The very wide confidence interval reflects the limited precision of the estimate in a sample of this size, but the key point is that severity, on its own, could not be shown to independently predict psychological difficulty once other factors were accounted for.

Asthma control told a different story. In the same adjusted model, only asthma control showed a significant effect on mental health: children with poorly controlled asthma had higher odds of developing mental health problems, with an adjusted odds ratio of 4.08, a 95 percent confidence interval of 1.03 to 16.13, and a P value of 0.04. In other words, a child whose asthma was poorly controlled faced roughly four times the odds of screening positive for psychological difficulties compared with a child whose disease was brought under command—regardless of how severe the underlying condition was classified to be.

The authors conclude that there is no interaction effect of asthma severity and control on the mental health of children with asthma, because mental health problems were associated only with poor asthma control, irrespective of severity. This distinction matters clinically. Severity is largely a fixed characteristic of the disease, determined by the intensity of the underlying inflammation and airway physiology, whereas control is the modifiable outcome of treatment adherence, inhaler technique, trigger avoidance and follow-up care. If poor control is the psychological culprit, then improving day-to-day asthma management may offer a direct route to protecting children’s mental health, even for those whose disease is intrinsically mild.

The practical recommendation that flows from the study is the integration of child mental health services into existing asthma management programs. In many low- and middle-income countries, including Nigeria, pediatric asthma clinics focus almost exclusively on respiratory outcomes—symptom scores, peak expiratory flow readings and exacerbation rates—while psychological screening is rarely performed. The findings from Umuahia suggest that this narrow focus may miss a substantial share of the disease burden. A child whose inhaler technique is poor and whose symptoms persist at night is not only at risk of a physical exacerbation; the same child is also at markedly elevated risk of emotional and behavioral problems that can undermine schooling, friendships and family life.

The study also carries lessons for research design. By recruiting matched controls and using validated instruments on both the respiratory and psychological sides, the work demonstrates that rigorous psychosocial measurement is feasible in a tertiary hospital setting in South-Eastern Nigeria, where such data have historically been scarce. The single-author design, funded entirely by the researcher’s personal contribution, underscores both the resourcefulness and the resource constraints of clinical research in the region. The study was approved by the Institutional Review Board and Health Research Ethics Committee of the Federal Medical Centre, Umuahia, in June 2021, with informed consent obtained from caregivers and assent from children aged eight and above, in line with the ethical principles of the Declaration of Helsinki.

For clinicians and policymakers, the message is straightforward but consequential. Screening for mental health problems should become a routine component of pediatric asthma follow-up, and interventions that improve asthma control—better adherence support, patient and caregiver education, and reliable access to controller medications—should be recognized as having potential psychological as well as respiratory benefits. Conversely, the finding that severity alone did not significantly predict mental health outcomes cautions against assuming that only children with severe disease need psychological attention. A child with mild asthma that is badly controlled may be more psychologically vulnerable than a child with severe asthma that is well managed. As childhood asthma continues to affect millions of families across Africa and beyond, studies like this one help redirect attention from what a disease is to how well it is lived with—and that shift, the evidence now suggests, could shape not only children’s lungs but their minds.

Subject of Research: The interaction of asthma severity and control on the mental health of children with asthma in South-Eastern Nigeria.

Article Title: Interaction effects of asthma severity and control on the mental health of children with asthma: findings from a South-Eastern Nigeria Tertiary Hospital

Article References: Ogbonna, I. F. (2026). Interaction effects of asthma severity and control on the mental health of children with asthma: findings from a South-Eastern Nigeria Tertiary Hospital. BMC Pediatrics. https://doi.org/10.1186/s12887-026-07670-0

Image Credits: AI Generated

DOI: 10.1186/s12887-026-07670-0

Keywords: asthma, asthma control, asthma severity, mental health, children, pediatrics, Nigeria, Strengths and Difficulties Questionnaire, Asthma Control Test, child health, chronic illness, BMC Pediatrics