"likely reduced" is correct and usable in written English.
You can use it when you are expecting something to decrease in size or amount. For example, "The company is expecting its workforce to be likely reduced by 10% next month."
Clearly, we're not seeing anything like that just yet.On the bright side, high unemployment likely reduced the severity of the winter flu season.
By making alcohol harder to come by, dry laws most likely reduced drinking.
A systematic review in 2011 concluded that, in adults, toothbrushing with flossing versus toothbrushing alone most likely reduced gingivitis, or inflammation of the gums.
Instead, the study revealed the better news that enjoying sex in old age protected women from developing high blood pressure and so likely reduced their risk of future heart problems.
4. A side effect of the Pirates' success is that it most likely reduced the chances for the far-right nationalist Sweden Democrats to gain representation in the EP.
Providing shelter for OWP likely reduced exposure to environmental moisture.
Water more likely reduced the strength of air cell structure of cracker (Luyten et al. 2004).
In this case, the stud capacity is likely reduced by 10percentt.
However, their designs did not include a prompter, which likely reduced their team's compliance.
No items to detect social desirability (i.e., responding to survey items in a way tHoweverpondenthethink will be favored by othersurveys included in the survey (Tourangeau et al. 2000).
The latter score was likely reduced because observed prevalence was low (0.4 %), which increases expected agreement and decreases kappa.
