Joint Over- and Underdiagnosis

A short, clarifying medical-statistics insight resolving the perennial 'is ADHD over- or under-diagnosed?' debate: it's BOTH, simultaneously. Prompted by two contradictory lectures, Scott's attending explains via base rates. With ~3% ADHD prevalence, 50% of true cases plus 10% of non-cases presenting for evaluation, and even a generously-excellent psychiatrist (85% sensitivity AND specificity), the arithmetic yields three things at once: the psychiatrist is right 85% of the time, yet the MAJORITY of people put on Ritalin shouldn't be (overdiagnosis) AND the MAJORITY who need it aren't getting it (underdiagnosis). It's the mammogram/base-rate problem in clinical clothing, and Scott notes it generalizes -- antidepressants and opioids are almost certainly both over- and under-prescribed too. A genuinely useful, counterintuitive, broadly-applicable lesson, briefly delivered.

Quality 67 · Strong. Low-Strong (67): a memorable, broadly-applicable, and counterintuitive base-rate insight (joint over- and under-diagnosis falls out of sensitivity/specificity math even for a good clinician) that genuinely resolves a common debate and generalizes across conditions. Held low-Strong because it's short and applies a standard Bayesian/base-rate result rather than developing something new.

Claude’s paradigm shift 46 · Moderate. Moderate (46): framing the over-vs-under-diagnosis debate as a false dichotomy both horns of which are simultaneously true is a fresh, clarifying application of base-rate reasoning.

Real-world impact 2 · Minor. A memorable base-rate insight resolving the ADHD over-/under-diagnosis debate; broadly applicable as a clarifying idea but confined to discourse, with no direct change to clinical practice → RWI 2.