About 5% of the clinical population is affected, though that figure is subject to sampling bias.

Lifetime prevalence is estimated at 1% in the general population and 2% to 16% in clinical populations.

Eysenck's research focuses mainly on cognitive factors associated with anxiety in normal and clinical populations.

Experience with clinical populations is highly regarded and often considered essential in the selection process.

High androgen levels are associated with menstrual cycle irregularities in both clinical populations and healthy women.

Executive dysfunction characterizes many of the symptoms observed in numerous clinical populations.

The approach is not restricted to a clinical population, but has been used extensively in the commercial world particularly in the fields of sales and management.

These assessments can serve a diagnostic purpose for a number of clinical populations.

None of the aforementioned methods has been properly validated in relevant clinical populations, and their accuracy is unknown.

Furthermore, much of the research on psychological outcomes for adoptees draws from clinical populations.