"reduced prevalence" is a correct and usable phrase in written English.
You would use this phrase to describe a decrease in the frequency of something, such as an illness or a negative behavior. For example, "The health department reported a reduced prevalence of illnesses in the community after the public health measures were put in place."
Patients receiving lithium therapy have a reduced prevalence of neurological and cardiovascular disorders.
We find evidence of such externalities: the intervention reduced prevalence of substandard and counterfeit drugs in incumbent outlets by half.
Although both trials reduced prevalence considerably, they failed to eradicate the parasite in the study region.
According to the most recent figures from the Kenyan Demographic and Health Survey the country has reduced prevalence from over 40% for middle-aged women to just 11% for adolescent girls.
Outbreaks reached higher prevalence when groups were larger, but subgrouping reduced prevalence.
In the CARRIAGE family, hypermobility was associated with a significantly reduced prevalence of hand (especially proximal interphalangeal joint) and knee OA and lower mean serum COMP levels, both in the total cohort and in non-hand-OA subgroups.
The report cites epidemiological studies, including prospective studies that have shown associations between healthy dietary patterns and a reduced, prevalence, and risk for depression and suicide.
Exclusion of men with benign prostatic hyperplasia reduced prevalence among men by approximately one percentage point (to 5.6% [CI, 4.5% to 6.6%]).
In three independent experiments, knockdown of LYSC-1 significantly reduced prevalence (Figure 3A) and intensity (Figure 3B) of P. berghei infections.
Adjusting HPV prevalence for under-representation of Wolof subjects reduced prevalence slightly to 13.0%.
However, shortness of breath when walking had a reduced prevalence in 2010 when compared to 2009.
