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The phrase "ascertained over several" is correct and usable in written English.
It can be used when discussing information or data that has been determined or established through multiple instances or sources.
Example: "The results were ascertained over several trials to ensure accuracy and reliability."
Alternatives: "determined through multiple" or "established over several".
Exact(1)
Cell death no longer occurred after that period and phenotype stability was ascertained over several cell passages in the absence of lovastatin [ 11].
Similar(59)
CVD events were ascertained over a median of 15 years.
Incident coronary heart disease and stroke events were ascertained over 9 years.
Adjudicated outcomes were prospectively ascertained over the ensuing 3 years for all subjects after enrollment.
Overall, we ascertained over 80,000 autosomal and X-chromosomal AIMs from over 450 worldwide populations (fig. 1).
Functional disability was ascertained through several self-reported variables.
Soft tissue sarcomas were ascertained by several methods.
SMNs were ascertained by several methods in order to obtain the most accurate estimation of the risk.
The validity of the RKHSM is ascertained by presenting several examples.
This was ascertained by monitoring doubling time over several days.
Participating organisations already used the questionnaire as a checklist to ascertain whether several quality management items were present.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com