The phrase "assertions among" is correct and usable in written English.
It can be used when discussing claims or statements made by multiple parties or individuals in a particular context.
Example: "The researchers examined the assertions among the various studies to identify common themes."
Alternatives: "claims among" or "statements among".
So we decided to fact-check the ongoing assertion among supporters of Planned Parenthood that it "provides" mammograms, especially given the focus on the issue at the recent House hearing.
Those two facts challenge a fundamental assertion among supporters of incarceration, who hold that higher imprisonment rates correlate with lower crime rates, a new Pew report points out.
Drawing from theoretical assertions tested among adults with chronic pain, this study aimed to determine whether pain-related self-efficacy mediates the adverse influence of pain-related fear on functional outcomes in a sample of youth with chronic headache.
Those assertions are among the many in "Waiting to Be Heard," the long-awaited memoir that is Ms. Knox's most extensive public testimony since she was convicted, and then acquitted, of killing her 21-year-old British roommate, Meredith Kercher.
But if testimony is informative, the assertions are among the riskier constituents of our vast background of 'dull' beliefs.
She emphasized Sonsini's assertion that, among chairmen of major corporations, not one in ten would have acted any differently.
The ministry, Answers in Genesis, believes that the earth is only 6,000 years old — a controversial assertion even among many Bible-believing Christians.
The Times review found that the F.B.I. had disproved the assertion, widespread among scientists who believe Dr. Ivins was innocent, that the anthrax might have come from military and intelligence research programs in Utah or Ohio.
A blogpost, made before PMQs, from Jonathan Portes, the director of the National Institute of Economic and Social Research appears to contradict somewhat the PM's assertion: Foremost among these is surely the question of whether work experience actually works; that is, does it actually improve the job prospects and opportunities of the young people it is supposed to help.
These studies support the assertion that among adolescent learners, low achievers are more likely to become "overwhelmed by assessments and demotivated by constant evidence of their low achievement thus further increasing the gap" (Harlen and Deakin Crick, 2003, p. 196).
