The phrase "a comparator was" is correct and usable in written English.
It can be used in contexts where you are discussing a comparator in a technical or analytical setting, such as in programming, electronics, or data analysis.
Example: "In the experiment, a comparator was used to measure the voltage differences between the two circuits."
Alternatives: "a comparator existed" or "a comparator functioned".
This suggests that in these trials a comparator was chosen to favour a priori the experimental intervention, at the cost of threatening the principle of equipoise.
Use of physician diagnosis as a comparator was therefore a limitation as individual physicians appeared to use a different set of criteria to diagnose VAP.
A comparator was successfully identified for 4,364 users (the remaining 440 metformin users for whom comparators could not be found were excluded).
Mechanisms for reducing delay based on look-ahead logic within individual comparators and mechanisms based on multiplexor architectures of a comparator are compared for both propagation delay and area.
Evaluations that are not comparative and do not consider both costs and consequences, and/or a comparator is classified as a partial evaluation (e.g., 1A, 1B, 2).
We found that decreases in SNR due to leakage and thermal noise in a comparator were independent of the sampling frequency.
Another possibility for a comparator is 'do nothing', if no eligible standard care for comparison is available.
MMX mesalazine users not matched to a comparator were excluded from the propensity-matched set.
18 We recognise that the use of an expectantly managed group as a comparator is not without difficulty.
The importance of a comparator is also evident when one describes measurements of tracheomalacia, bronchomalacia and or airway stenoses.
Previously, it has been demonstrated that presenting benefits of specific treatments or behaviour to patients as a relative risk reduction with a comparator is a successful tactic [ 19].
