The phrase "ascertained within a" is correct and usable in written English.
It can be used when discussing the process of determining or discovering something within a specific context or framework.
Example: "The results of the experiment were ascertained within a controlled environment to ensure accuracy."
Alternatives: "determined within a" or "established within a".
Improvement was ascertained within a 1-month window of the date 6 months after cessation of ATT when possible.
Unlike in Dom's study, our cases were ascertained within a well-characterised cohort (Tronko et al, 2006; Brenner et al, 2011).
In the present study, we have assessed the geographical distribution of the pathological G4C2 expansions in an extended pan-European patient cohort of FTLD patients, originating from Italy, Germany, Portugal, Sweden, Spain, Czech Republic, Bulgaria, Austria, and Belgium, ascertained within a newly formed, European EOD consortium.
The average GC content was calculated at each of the codon positions and plotted with p-values ascertained within the human sequences using a Fisher Exact Test and/or Yates-corrected Chi-square test.
Briefly, case children under 15 years of age with incident leukemia were ascertained within 72 h of diagnosis via a rapid reporting system established with the diagnosing hospitals.
A hospital's actual Medicare accreditation status cannot be ascertained within the NIS.
With regard to adult oral health, a clear increase in natural tooth preservation can be ascertained within the last decades [ 9].
Cases were women for whom a diagnosis of histologically confirmed primary epithelial ovarian cancer was ascertained within 1 year of consent.
Use of these medications was ascertained within 30 days after discharge, but patients were not required to survive for a minimum number of days after discharge to be eligible for study.
Using this model the final density of the sintered powder metallurgical (P/M) hollow copper extrudates can be ascertained within the ranges of investigation.
Changes in treatment regimen were ascertained within three months of the index test.
