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Table 2 Four common features

From: Late-manifestation of attention-deficit/hyperactivity disorder in older adults: an observational study

1. The age of patients with ADHD was significantly lower than the rest of the sample

2. The type of these ADHD cases was inattention-predominant ADHD

3. These ADHD cases might have been a late manifestation of a long-standing disease

4. All patients with ADHD chronically experienced significant life events, before manifestation of ADHD symptoms