This is the 4775th most frequent Korean word.
고위험군의
"High-risk group"
Here, "고위험군의" is used as an adjective modifying "환자" (patients), stating that the patients belong to a high-risk group.
고위험군의 환자는 특별한 관리가 필요합니다.
Patients in the high-risk group require special management.
In this sentence, "고위험군의" specifies the type of disease that is considered high-risk, describing its association to the high-risk group.
이 약은 고위험군의 질병에 사용됩니다.
This medicine is used for diseases in the high-risk group.
"고위험군의" acts as an adjective defining "사람들" (people), indicating these individuals are part of the high-risk group.