The phrase "a decrease in efficacy" is correct and usable in written English.
It can be used when discussing the reduction in effectiveness or performance of a treatment, intervention, or process.
Example: "The study revealed a decrease in efficacy of the medication over time, prompting further investigation."
Alternatives: "a reduction in effectiveness" or "a decline in performance".
During this time a decrease in efficacy was recorded and the cost of the product increased.
Women taking SJW and oral contraceptives could experience a decrease in efficacy resulting in an increased number of breakthrough bleeding events and unplanned pregnancies [ 14].
The cost-saving profile is preserved also if an increase of costs is considered as well as a decrease in efficacy and compliance.
Although no toxic effects were observed at the higher concentrations of the anti IL-1β anti IL-1βantibodyse in efficacy was apparent.
Conversely, a decrease in efficacy or potency at other important receptor targets may necessitate increased contributions from NMDA receptors to reach the same immobilizing anesthetic endpoint.
An examination of the week 12 PASI 75 and PGA response measures suggested a decrease in efficacy with increasing weight, a trend also noted for other psoriasis systemic and biologic treatments.
Regardless, if PZP recipients extend reproductive cycling and behavior into the non-breeding season, any decrease in efficacy that leaves them fertile in the fall/winter will help drive increases in late season conception.
While studies of selection in polyploids are very limited, a recent empirical study in the allotetraploid Capsella bursa-pastoris analyzed about 40% of the genome and showed a decrease in the efficacy of purifying selection in one of the subgenomes but an increase in another subgenome8.
A three-dimensional computational fluid dynamics (CFD) model was developed and used to evaluate concepts of boom sprayer setup to orchard spraying to reduce drift without a decrease in biological efficacy.
Nonetheless, in a longer-term study with seven OnabotA injections in CM patients, based on a decrease in initial efficacy of OnabotA therapy after the third injection, authors concluded that actual improvement and amelioration of daily headache under OnabotA therapy needs several months to be consolidated [52].
As would be expected, a decrease in vaccine efficacy results in an increase in outbreak size (Figure 3D).
