It is fairly common that we see an adolescent or a young adult who presents to us seeking treatment for symptoms of attention deficit/hyperactivity disorder (ADHD) but who does not have a history of ADHD in childhood.
Recently, some studies that enrolled children at an early age and then followed them for many years (called “birth cohort” studies) have suggested that a “late-onset” form of ADHD also exists.
But, the authors of the paper we are discussing here argue that the birth-cohort studies previously done have many limitations. Specifically, they identified ADHD only by screening questionnaires, did not consider alternative causes of the ADHD-like symptoms, and did not obtain complete psychiatric histories.
In this study, the authors have tried to address the limitations of previous studies by looking at more detailed psychiatric assessments administered over time.