The phrase "a study that required" is correct and usable in written English.
It can be used when discussing the demands or prerequisites of a particular study or research project.
Example: "The research team conducted a study that required extensive data collection over several months."
Alternatives: "a study that necessitated" or "a study that demanded".
Therefore, we suggest trying to keep a clear sight of the animal contour in a study that requires absolute quantification.
Such a study would have a greater likelihood of undergoing an expedited ethics review than a study that requires active participation from the respondent.
MRI of the breast is a study that requires the administration of a gadolinium-containing contrast agent during the study [ 1, 2].
A study that requires just a few simple adaptations, like a change in unit costs or discount rate, is more easily transferable than a study that requires many complicated adaptations, like a change in resource use pattern or a change in the case mix of the study population.
The use of a mailed questionnaire that can be completed and sent back by the participant is a potential strategy that would save costs over a study that requires the respondent to be present at the clinic to be enrolled.
The participation rates may have been low because: it was a research study that required consent, patients may not have forwarded the information on to relatives, or reflects a lack of interest in preventive health care.
Neighborhoods were included in the study if at least several members were interested in participating in a 2-week study that required a 3-hr training session and a twice-daily routine of reporting and measurement.
The first 2 cases to be identified were a serendipitous discovery made in the course of an unrelated experimental study that required a detailed neuropathologic and immunochemical examination of the entire brain (5 ).
