The phrase "are underlying differences between" is correct and usable in written English.
It can be used when discussing distinctions or variations that exist between two or more subjects or concepts.
Example: "In the study of cultural practices, there are underlying differences between Eastern and Western traditions that influence social behavior."
Alternatives: "exist fundamental differences among" or "are essential distinctions between".
The differential response in in pair-and single-housed animals suggests that amygdala is sensitive to housing conditions and that there are underlying differences in this brain area between animals reared under different social conditions.
Nonetheless, there were underlying differences in case-mix between women with private and public coverage.
There may also be underlying differences in the occurrence of different conditions between countries and in the delivery and effectiveness of healthcare, contributing to observed differences in prevalence figures.
What are the underlying differences between sound recording and publishing rights?
There are some underlying differences between this device and classic BlackBerry devices.
However, it also is possible that there are underlying etiologic differences between Asians and other ethnic groups that account for these differences.
Observed differences in evolutionary rates of H7 HA on different NA subtype backgrounds could not be attributed to underlying differences between avian host species or virus pathogenicity.
The second highest quality evidence is from randomized controlled trials where researchers can be confident that the intervention, not underlying differences between groups is the cause of different outcomes between groups.
While there has been a considerable focus on AA SSc patients, there have been few studies on underlying differences between healthy AA and C that might explain the predisposition of AA to SSc and interstitial lung disease (ILD).
Such self-selection bias is caused by the underlying differences between attendees and nonattendees to the screening program that would also be present in the absence of screening.
