The phrase "a certain decline of" is correct and usable in written English.
It can be used when discussing a specific but not precisely defined decrease in something, such as quality, quantity, or performance.
Example: "There has been a certain decline of interest in traditional media among younger audiences."
Alternatives: "a noticeable decrease in" or "a specific drop in".
In the case of the women a certain decline was observed in the grade of knowledge and interest related to FGM.
While the line transect method assumes that the probability of detecting objects on the line (distance=0) is p=1, and as objects are far from the line the probability of detection follows a certain declining function, the main assumption of the strip transect method is that the probability of detecting objects within the strip is 1 (i.e. no objects are left undetected).
Indeed, the present data showed a certain mild decline of source activities in several sources including the left operculo-insular cortex that would fit the adaptation of the cortical responses seen in previous study [47].
A certain initial decline of invitation and drop-out during follow-up must be expected.
Serum β2MG not only was associated with lower eGFR, but also predicted the value of negative slope in eGFR and the certain decline in eGFR of ≥25% from baseline.
People who don't do anything after a certain age decline – the lack of mental stimulation has a bearing on your physical side too.
The SEC has suggested a more rigorous, co-ordinated market-wide system of "circuit breakers", which would require all exchanges to stop or slow trading for a few minutes if the market experiences a certain rate of decline.
Any associations documented in older populations are likely to be more pronounced among younger groups, as older individuals may expect a certain amount of decline in health and functionality as a normal part of the experience of growing older.
We assumed a certain percentage decline in the death rates because of stronger prevention and control measures or a certain percentage rise in the death rates resulting from weaker prevention and control efforts.
Patients with longer disease duration may tolerate more limitations in physical function and adapt to a certain amount of declining function.
Not only do individual clones rise and fall temporally, as previously shown [ 19], but as any individual clone of a certain frequency declines, it is replaced by another of similar frequency.
