The phrase "a decrease in effectiveness" is correct and usable in written English.
It can be used when discussing a reduction in the ability of something to produce a desired result or outcome.
Example: "The new policy led to a decrease in effectiveness of the team's performance metrics."
Alternatives: "a decline in efficiency" or "a reduction in efficacy."
We found that reducing R0 resulted in an increase in the effectiveness of confinement to home and a decrease in the effectiveness of school closings.
This is because the increase in effective population size is exactly balanced by a decrease in the effectiveness of the selection process (Maruyama 1970; Cherry and Wakeley 2003).
Broadly speaking, any mechanism that yields the restoration of activity in the PI3K, MAPK, AKT or mTORC1 pathways, or increased activity of the ER pathway, will restore the proliferation-inducing and/or apoptosis-opposing effects of these pathways, and will yield a decrease in the effectiveness of PI3K inhibitors.
It reveals that any geometrical changes which decrease the pressure drop in the optimum situation, lead to a decrease in the effectiveness and vice versa.
Control chart methods which were developed in industrial and manufacturing settings for process and production monitoring, can be used to monitor disease incidence in real-time and promptly detect a decrease in vaccine effectiveness.
A decrease in vaccine effectiveness over time, especially when acellular vaccines were used for primary doses and boosters, and pathogen adaptation to the immunity conferred by vaccines have been proposed as possible causes of the resurgence.
However, a decrease in the effectiveness of the glucosinolate-myrosinase system would very likely render crucifer crops more susceptible to generalist insect herbivores which are sensitive towards glucosinolate-based defenses [5] [9], [22].
In some cases TCAM use may have interactions causing a decrease in ART effectiveness or even toxicity.
Dose reduction gave rise to a complex viral kinetic pattern, which could be only explained by a decrease in interferon effectiveness in blocking virion production.
