The phrase "absence of trial" is correct and usable in written English.
It can be used in contexts discussing legal matters, scientific experiments, or any situation where a trial or test is expected but not present.
Example: "The absence of trial in this case raises questions about the validity of the findings."
Alternatives: "lack of trial" or "nonexistence of trial".
In the absence of trial results that are applicable to the target population, nested case-control studies might be an alternative to full-cohort analysis.
CONCLUSIONS: These findings suggest that, in patients with moderate to severe chronic kidney disease, safety concerns about adverse outcomes and the absence of trial data for this population may limit the use of guidelines-recommended therapies and interventions for non-ST-segment elevation acute coronary syndromes.
The absence of trial evidence makes independent validation of this result impossible.
All models are simplifications of reality, but may still be useful despite their imperfections in the absence of trial evidence.
Complexities inherent in measurements of alcohol, sex and HIV do, however, limit the ability to definitively investigate causality in the absence of trial data.
Moreover, the absence of trial data on these products means that patients may inadvertently be paying for, and using products which are unsafe or unsuitable for them.
On the contrary, he added, the absence of trials would be a success because it means national institutions are functioning properly and are handling these cases themselves.
In the absence of trials, some of the defendants, especially the former correctional officers, are using their sentencing hearings, before Judge Ellen L. Hollander, to argue that they deserve a measure of sympathy.
In addition, the recommendations for some of the biologic drugs are based solely on pharmacological parameters due to the absence of trials, and larger randomized controlled studies are needed to establish the safety of their use by patients with rheumatic diseases.
Clinical judgment, opinion, and expertise prevail in such circumstances in the absence of trials.
CONCLUSION: In the absence of trials identifying the most effective recruitment strategies, investigators may need to experiment, amending their protocol intermittently until target enrollment numbers are reached.
