Researchers are increasingly using these resources 1 which provide a means for researching questions in primary care that cannot feasibly be addressed by other means, including unintended consequences of drug interventions, where ethical considerations, the required numbers of patients, or length of follow-up can make a randomised controlled trials impractical.
Adelson's lawyer, Rusty Hardin — he recently represented Roger Clemens on Capitol Hill, defending him against accusations of steroid use — had argued that "confidential, private or trade secret information" in the case made "media access to the trial... impractical and prejudicial".
Nevertheless, in situations in which a randomized trial is impractical or would take a long time to complete, valuable information can be gathered from an observational study, provided that the study is designed and analyzed appropriately.
They are good for generating hypotheses or perhaps when clinical trials are impractical.
The difficulty with this assumption is that there are situations where randomized control trials are impractical or unethical [ 31, 74].
Case study approaches are also considered suitable for exploratory research of inadequately understood phenomena, and where randomized control trials are impractical or unethical [ 44].
Expert opinion (E) is a separate category for recommendations in which there is as yet no evidence from clinical trials, in which clinical trials may be impractical, or in which there is conflicting evidence.
A trial would be impractical while war was still raging; a trial would disrupt the peace process; a trial would upset a hard-won equilibrium and reopen old wounds.
Clinical trial design is impractical for assessing the effectiveness of some interventions, such as face masks and isolation, because of ethical considerations relating to epidemics in general.
Given the use of different insulin delivery systems and the complexity of the IDeg OD Flex dosing regimen, a blinded, double-dummy trial design was impractical.
Large scale randomized trials lasting years may be necessary to show whether HIT can prevent diabetes, and such trials may be impractical.
