The phrase "selection of controls" is correct and usable in written English.
You can use this phrase when you are talking about a specific group of objects that have been chosen for a particular purpose. For example, "Researchers conducted a study on the effects of different environmental factors by selecting a selection of controls to compare with the experimental group."
To minimize bias in the selection of controls, field workers will revisit selected households ≤3 times if eligible children are not at home on the first visit.
GIS also have potential uses in the selection of controls for an epidemiologic study, as they are usually randomly selected from the same geographic area as the cases.
It may also facilitate future breast cancer studies by allowing selection of controls among patients undergoing surgical procedures other than breast surgery, minimizing concerns about overmatching.
The design of this study, with concurrent selection of controls and matching by hospital ward and date of screening, provides a more accurate estimation of relative risks for CPKP colonization than previous investigations.
The implications of design elements on inferences are first discussed, followed by a review of three types of case control study differentiated from each other by the timing of the selection of controls.
Selection of controls was realised through indication of a participant of clinical groups to be included in the study.
Patients with clinical suspicion of ventilator-associated respiratory infection were considered as cases and compared with a selection of controls matched by age, comorbidities, severity scales and days of mechanical ventilation.
The selection of controls from patients with "explained" mitral regurgitation has both strengths and weaknesses.
None of the studies reporting discrepant findings adopted our stringent criteria for the selection of controls.
Further exploration for sources of biases among studies showed that the selection of controls was not biased.
Hence, we decided to use a PPD >15 mm of induration as the cut-off for selection of controls.
