Unemployment and sickness allowance onset and prevalence: a longitudinal register-based study.

Mental health disorders in childhood represent a critical public health concern with far-reaching implications for individual development and societal well-being. Approximately 50% of mental health conditions manifest before age 14, significantly impacting educational attainment, social relationships, and long-term occupational outcomes []. These early-onset conditions often predict increased risk for physical health complications, substance use disorders, and reduced quality of life in adulthood [–], underlining the paramount importance of early identification and intervention. Despite the well-documented significance of early mental health support, substantial underdiagnosis exists among school-age children [, ]. While 10–20% of children worldwide experience clinically significant mental health problems [], only about one-third receive appropriate diagnosis and treatment []. This diagnostic gap stems from limited access to mental health professionals, stigma surrounding mental health, and inherent challenges in identifying mental health concerns in young populations [–]. Young children typically lack the emotional vocabulary and self-awareness to articulate psychological distress, instead expressing difficulties through behavioral changes, physical complaints, or academic struggles. Additionally, they depend on caregivers to recognize these signs and initiate appropriate assessment. Traditional diagnostic approaches such as clinical interviews and standardized assessments rely heavily on observable behavioral symptoms or parent/teacher reports, potentially missing subtle early indicators of psychological distress []. Conventional screening methods are also resource-intensive and time-consuming, making widespread implementation challenging []. Beyond these practical limitations, conventional instruments face a fundamental epistemological challenge. They measure externally observed behaviors, which serve as, at best, an indirect proxy for a child’s internal psychological world. This reliance on external observation creates a diagnostic gap, as it is insensitive to internalized distress that may not manifest in disruptive behavior [, ]. Such subjective, report-based instruments can suffer from a lack of objectivity and are vulnerable to reporter biases, making them an imperfect ‘gold standard’ for initial screening. The effectiveness of observational screening is highly dependent on healthcare worker training and confidence [], while screening tools developed in Western settings may not adequately reflect mental health manifestations in diverse cultural contexts [, ].