The phrase "ascertained from such" is correct and usable in written English.
It can be used when referring to information or conclusions that have been determined based on specific sources or evidence.
Example: "The results of the study were ascertained from such data collected over the past year."
Alternatives: "determined from such" or "derived from such".
A sense of Britain and its place in the world in 1913 is hard to ascertain from such a distance.
"Now he's married to a Kennedy, and he says things like 'I ascertained such and such,' " Mr. Mele said.
All variables used in this study were derived from data elements ascertained from claims submitted for reimbursement, such as ICD-9 diagnosis codes and CPT-4 procedure codes.
Such information is ascertained from specific statements in medical records, reports from private pathology laboratories and radiotherapy units, and death certificates.
One patient had received oxaliplatin in combination with cyclophosphamide and gemcitabine before enrolment in the current trial; the number of oxaliplatin cycles could not be ascertained from the medical records and as such, her oxaliplatin cycles were excluded from the platinum cycle calculation.
For GWAS ascertained from the same or closely related populations, such an assumption is reasonable.
Finally we acknowledge that while our clinically ascertained subjects were not drawn from a cohort with a single diagnosis such as autism or schizophrenia, they were ascertained from a heterogeneously affected group in whom genetic testing was considered clinically relevant.
The main exposure variable was receipt of opiate substitution treatment (such as oral methadone, buprenorphine, dihydrocodeine) 21 ascertained from primary care records.
Data regarding risk factors for atherosclerosis such as diabetes, dyslipidemia, hypertension, and smoking are ascertained from the EMR.
Some parents may not be familiar with such medical terms and this would need to be ascertained from them at an early stage in the consultation.
