The phrase "a certain difference in" is correct and usable in written English.
It can be used when discussing a specific but unspecified difference in a particular context or subject matter.
Example: "There is a certain difference in the way each artist interprets the theme of love in their work."
Alternatives: "a specific difference in" or "a notable difference in".
Sample size requirements to detect a certain difference in PRO could be larger if different administration formats are used because of greater standard deviations and because effect estimates are likely to be attenuated by additional (non-differential) measurement error [ 9, 10].
There seems to be a certain difference in Porphyry's and Plotinus' emphasis here, however.
The properties of obtained BiOCl samples showed a certain difference in crystallinity, morphology, structure, specific surface area, composition, band gap energy and exterior color.
Chronoamperometry and chronocoulometry show that there is a certain difference in the behaviour of Pt and Ag working electrodes due to uneven passivating anodic processes.
If we expand shorter paths with a certain difference in performance with additional factors, the worse performing path has a greater chance of being expanded into a path that will later outperform other paths.
Other imperfections are considered by adjusting the market penetration rate, taking account of a certain difference in the real penetration value vs the one calculated with pure cost figures.
A certain difference between the histograms in the area 0.8 < Kr < 0.95 is observed.
We did not find any certain differences in reoperation within 2 years, or revision within 14 years, between patients born in Sweden and immigrants.
They had medium porosity, a similar texture and certain differences in composition.
However, these parasites have different hosts, different times of blood cycle (24 or 48 h) and certain differences in their lipid metabolism (Dechamps et al., 2010a).
