The phrase "among certain groups of" is correct and usable in written English.
It can be used to refer to specific categories or demographics within a larger population.
Example: "The new policy has gained popularity among certain groups of environmental activists who prioritize sustainability."
Alternatives: "within specific demographics of" or "among particular categories of".
There are already signs of similar problems among certain groups of healthcare professionals.
Among certain groups of Sinhalese Buddhists, who make up the majority in the country, chauvinism is growing.
Among certain groups of people in certain parts of town, he has been elevated to a celebrity status a few rungs shy of apotheosis.
It is much less clear that inciting such animosity — and indeed hatred — among certain groups of Americans toward their fellow citizens will serve our country well.
However he also has spurred intense dislike among certain groups of conservatives, particularly those who oppose his view of environmentalism and a limited free market.
"Among certain groups of people I know," she says, "it now has a certain social cachet to say that you are starting a non-profit organisation".
The national evidence suggests that the prevalence of diabetes in Algeria has increased from 6.8% in 1990 to 12.29% in 2005, but is quite higher among certain groups and areas of the country.
But because the rate of injuries has outpaced increases in participation among certain groups, experts suspect that many of these converts may not be lifting correctly.
Before the 18th century there had been evidences of national feeling among certain groups at certain periods, especially in times of stress and conflict.
Currently a lack of knowledge exists about aspects of STKU among certain groups who demonstrate khat use disorders (e.g., daily khat users).
The 2011 ACIP recommendation for hepatitis B vaccination for adults with diabetes, an increasing incidence of diabetes, and the high prevalence of diabetes among certain groups recommended for hepatitis B vaccination (e.g., persons with end-stage renal disease) suggests that a review of vaccine efficacy among persons with diabetes may be timely.
