The phrase "ascertained with both" is not correct in standard written English.
It may be intended to convey that something has been confirmed or determined in conjunction with two parties or elements, but the phrasing is awkward.
Example: "The results were ascertained with both the researchers and the participants involved in the study."
Alternatives: "confirmed with both" or "determined with both".
In all studies, the health outcome had to be CTS ascertained with 1) symptoms (questionnaire or interview or both) in combination with NCT or 2) symptoms alone but confirmed by qualitative interview.
The reduction of substrate was ascertained with XRD, FTIR and XPS analysis.
These voters should not be disfranchised where their intent may be ascertained with reasonable certainty, simply because the chad they punched did not completely dislodge from the ballot.
Survival distributions were estimated by the Kaplan Meier method, and the significance of differences between survival rates was ascertained with the log-rank test.
Views on politics and the law were frequently ascertained with reference to where one took the black brew.
The sample size was 22. Dentin sensitivity was ascertained with an accurate cold testing device that slowly decreased in temperature.
Under the specified condition, the optimal operating parameters are ascertained, with the optimal pinch point temperature difference of 5 K.
Our courts have repeatedly held that, where the intention of the voter can be ascertained with reasonable certainty from his ballot, that intention will be given effect even though the ballot is not strictly in conformity with the law...
It is that contrary to what you may have gleaned from the literary deconstructionists, there is a truth, and if it can't be ascertained with total assurance, it can certainly be closely approached, like the calculus approaching the curve.
It hinted broadly that dimpled chads should be counted, quoting an Illinois Supreme Court opinion declaring that "voters should not be disfranchised where their intent may be ascertained with reasonable certainty".
