The phrase "ascertain exposure" is correct and usable in written English.
It can be used in contexts where you need to determine or find out the level of exposure to a particular risk, situation, or condition.
Example: "The researchers aimed to ascertain exposure to environmental pollutants among the participants in the study."
Alternatives: "determine exposure" or "identify exposure".
Job title from the previous census was linked to a job exposure matrix to ascertain exposure.
Interviews were conducted to ascertain exposure history, and medical records were reviewed.
In all studies, questionnaires and/or passive/active samplers were used to ascertain exposure.
All studies used job titles to ascertain exposure and death certificates to identify coronary heart disease (12 studies), stroke (15 studies) and overall cardiovascular mortality (9 studies).
To reflect differences in how mental healthcare services operate in the five countries, different procedures are used to ascertain exposure status to either a 'specialisation' or 'personal continuity' of care approach.
Early studies relied on questionnaires to ascertain exposure as well as symptoms, making it difficult to exclude responder bias as the explanation for the associations that were found (Duhme et al. 1996; Weiland et al. 1994).
However, this study was cross-sectional and relied on retrospective self-report to ascertain exposures and outcomes.
Although we recommend the use of complex modeling strategies to estimate exposures whenever possible, simple traffic density might often be the only measure feasible to ascertain exposures in the large populations needed for childhood cancer studies.
A second method of ascertaining exposure to antineoplastic drugs (method 2) was based on telephone interviews with pharmacists and with senior nurses in nursing departments from all 94 general hospitals (357 departments) and 19 diagnostic and treatment centers in BC.
We also assessed the representativeness of the study participants; methods for ascertaining exposure; comparability of exposure groups (including unexposed) in terms of age, sex, socioeconomic status, non-response bias, health outcomes, determination, and validation of outcomes; internal validity; and assessment and addressing of confounding factors.
One star was given to each item in the category of selection: representativeness of the sample in the community and the use of a secure record or structured interview where the researcher was blind to the case/control status for ascertaining exposure.
