The phrase "are thought to increase" is correct and usable in written English.
It can be used when discussing beliefs or assumptions about the effects or outcomes of something, often in a scientific or analytical context.
Example: "These factors are thought to increase the likelihood of success in the project."
Alternatives: "are believed to enhance" or "are considered to boost".
In children with autism spectrum disorders (ASD), high rates of idiosyncratic fears and anxiety reactions and thought disorder are thought to increase the risk of psychosis.
Some are thought to increase egg production.
Problems in childhood are thought to increase chances of depression, but many people who have had happy and stable childhood are still affected.
In this regard, supranormal stimuli are thought to increase such responses.
It is not only mediators that are thought to increase the rate of callus formation in the presence of TBI.
Actively metabolizing tissues are thought to increase blood flow by releasing vasoactive substances such as adenosine, a potent vasodilator [11].
Therefore, concentrations of Zn, Mn, and Cu in root cells are thought to increase immediately after the onset of Fe deficiency.
Cumulatively, these repetitive overhead activities are thought to increase the risk of shoulder injury and, subsequently to affect players' physical conditioning as well as team performance.
That prediction, too, was confirmed via a series of manipulations (e.g., semantic relatedness, testing delay) that are thought to increase gist reliance.
Combination therapies such as hydroquinone, tretinoin, and corticosteroids have been used in the treatment of melasma, and are thought to increase efficacy as compared with monotherapy.
Fungi, in particular aquatic hyphomycetes, recognized as dominant players in microbial decomposition of leaf litter in streams, whereas bacteria are thought to increase their importance only after leaf material has been partially broken down.
