The phrase "a number of methodological differences" is correct and usable in written English.
It can be used when discussing various approaches or techniques that differ in research or analysis.
Example: "The study revealed a number of methodological differences between the two research teams, impacting their results."
Alternatives: "several methodological variations" or "various methodological distinctions".
These discrepancies could relate to a number of methodological differences between the studies, including different age ranges (3 years in our study compared with 6 years in Herting et al)., method of assignment of pubertal group/score (self-report pictorial questionnaire versus the Peterson Developmental Scale (Petersen et al., 1988)), and hormone sampling method (blood versus salivary assays).
Although the two indicators take a broadly similar approach, there are a number of methodological differences, and they were developed for different purposes.
A number of methodological differences might account for these findings, such as anesthetics with different effects on intracortical inhibition [50], or weaker stimulation velocity, as suggested by ref. [51].
Just recently, several studies of the estimated costs of the Energiewende until 2025/2030 have been published [3 5], and despite a number of methodological differences they arrive at comparable figures.
We pinpointed a number of methodological differences between the functional imaging studies and conclude that these may contribute to the observed variance between results.
This may be partially explained by a number of methodological differences.
The ability to generalize from the findings of previous research regarding staff views towards smoking bans is limited by a number of methodological features and differences in methodologies between studies.
A number of methodological factors may be responsible for these differences, including differences in task demands, materials and severity of mood.
We attribute these differences to several factors, including a number of methodological concerns as well as divergence relating to the "perceived value" of corporate governance across distinct environments.
The results from the two studies are not directly comparable, owing to a number of major methodological differences, including different measurement protocols and fundamentally different paradigms.
Finally, there are a number of methodological factors which could account for the difference in findings.
