The phrase "are frequently confined to" is correct and usable in written English.
It can be used to describe situations, behaviors, or characteristics that are often limited or restricted to specific contexts or groups.
Example: "The findings of the study are frequently confined to a narrow demographic, which may affect the generalizability of the results."
Alternatives: "are often limited to" or "are typically restricted to".
In addition, elderly populations are frequently confined to BR.
Potential cases may be missed or wrongly dated when coded data alone are used to identify patients with RA, as diagnostic suspicions are frequently confined to text.
Whereas conventional spectroscopic methods are frequently confined to laboratory settings, combining QCLs with frequency-matched thin-film MIR waveguides has the potential to offer highly sensitive, selective spectral information that can be packaged into miniaturized sensing devices.
Although clear-cell tumours are frequently confined to the ovaries at presentation, they are associated with a poor prognosis and are thus treated as high-grade neoplasms (Schwartz et al, 2002).
This is consistent with many earlier observations that well-distinguishable structure forming repetitive elements are frequently confined to groups of closely related species, where the distribution indicates direct exchange of genetic material (see [ 12] for examples, but also for evidence for mobility).
A vocal advocate for Uighur rights who is frequently confined to his home by security personnel, Mr. Tohti questioned the sparse narrative issued by the police, noting that news media restrictions have in the past prevented independent reporting on violent episodes involving Uighurs.
EEMD is a powerful tool for non-stationary signal analysis, but this method is frequently confined to experiments and applied research.
Staff members can no longer escort patients on the grounds alone, and patients are more frequently confined to their units.
S. buxtoni, a very exophilic species, which is more frequently confined to termite nests than to other biotopes [6], [15], [22], was indeed collected mainly in two termite mounds at Fouloum, where it represented 95% of the collection.
Discontent with the ruling élites of Europe for that is how they are frequently perceived is not confined to Britain.
