The phrase "admitted to a group of" is correct and usable in written English.
You can use it when referring to someone being accepted or allowed to join a specific group or organization.
Example: "After a rigorous selection process, she was finally admitted to a group of elite scholars."
Alternatives: "accepted into a group of" or "joined a group of".
Mr. Putin admitted to a group of interviewers from the newspaper Kommersant that he was charmed by Mr. Clinton.
That afternoon, swinging my own small stick, I admitted to a group of students, faculty and administrators that I thought the penalties were absurd and the violations inconsequential in a system that was basically corrupt.
At a town hall event during Obama's trip to China, the web-savvy President admitted to a group of Chinese youth in Shanghai that he's never used Twitter.
More recently, RCMP Commissioner Bob Paulson admitted to a group of First Nations chiefs that there are racists in his force and that weeding them out would be key to tackling the Missing and Murdered Indigenous Women (MMIW) crisis.
He admitted to a group of people in Detroit back in January 2016 that although he was asked to speak at her high school graduation, he declined ― not because he didn't want to, necessarily, but because he thought he'd be too emotional.
Flores and Du Randt have admitted to meeting a group of men in Northern Ireland.
First, our cohort was a group of patients admitted to a cardiac care unit.
To compare two groups of patients admitted to a general ICU to determine the influence of the accentuated reduction in the use of human albumin to correct hypovolemia and hypoalbuminaemia on the morbidity/mortality and costs of hospitalization.
Part of this group was admitted to a juvenile justice institution (JJI) subsequent to their arrest.
The study sample was large and involved a diverse group of critically ill adults admitted to a medical ICU.
We assessed whether there were significant differences in outcome between patients admitted to an ICU and a similar group of patients managed in general surgical wards.
