The phrase "ascertained data on" is correct and usable in written English.
It can be used when referring to information that has been determined or verified regarding a specific subject or topic.
Example: "The researchers presented ascertained data on the effects of climate change on local ecosystems."
Alternatives: "verified information about" or "confirmed data regarding".
The object of the survey was to ascertain data on the number of forest visits for the previous 12 months for the purpose of outdoor recreation, the length of each forest visit, the distance traveled to a recreational site, and socio-economic data, such as age, income of respondents, and village size, if possible.
We cannot ascertain data on the development of conditions that did not require hospitalization, such as out-of-hospital atrial fibrillation, stroke or hemorrhage, which may have occurred over the 4 year period, and as such our study may be underpowered due to the limited number of stroke hospitalizations.
The unique personal identity number enabled us to ascertain data on earlier utilisation of healthcare as well as to adjust for sex, age, and socioeconomic status.
We also interviewed participants to ascertain data on smoking status, the number of cigarettes smoked daily, occupation, and the use of regular physical exercise for 15 minutes or more a week.
To further ascertain data quality, frequencies were run on all data fields to identify and eliminate obvious outliers due to errors in data entry.
Selection criteria were applied to ascertain data from NH residents older than 65 years old with Alzheimer' disease or other dementia, based on documented medical diagnosis.
The data sources used to ascertain information on these criteria include electronic and paper medical records, other electronic databases, and patient interviews.
Prospectively recorded data will be used to ascertain information on adverse outcomes that occurred during follow-up and after entry into the cohort.
We ascertained detailed data on race/ethnicity and socioeconomic status (SES) based on education level through standardized questionnaires administered at baseline and clinic follow-up visits, as previously described (Hanrahan et al. 1992).
