английский => русский Медицина Медицина (в целом) epidemiology, risk groups

Контекст: "Proxy populations
It is often necessary to use proxy defi nitions for at-risk populations that are not a distinct social group. A
proxy defi nition uses a sociodemographic characteristic of a group, such as occupation, or places where
persons engaging in risk behaviours are likely to be found (such as men at bars, male migrants living in
dormitories, etc.).
The proxy defi nition is not the cause of the increased risk for HIV. For example, truck drivers are often used
as a proxy defi nition for clients of sex workers because some studies show that a higher proportion of
truckers are reported to be clients of sex workers than men in the general population. However, on its own,
driving a truck is not a risk for acquiring HIV. Similarly, prisoners are often a proxy defi nition for most-at-risk
populations. In some settings, prisoners have been found to inject drugs or have anal sex."

Смысл абсолютно ясен, интересует вопрос: существует ли стандартная фраза на русском ("группа риска" не подходит).