Exact(1)
Unfortunately, 88% of the RCTs they found had a risk of systematic bias potentially threatening study validity [ 1].
Similar(59)
Low response rates increase the potential for bias and threaten study validity.
Inadequate adherence in clinical trials contributes to significantly increased study costs, complicates statistical analysis and threatens study validity [ 26– 28].
These criteria resulted in 44,631,615 acceptable allocations and good performance in terms of pairwise medical facility frequencies, with 95% of all clinic pairs (total of 946 pairs) randomized to the same condition with probabilities of 40% to 60% (designs resulting in many instances of cluster pairs never/rarely or always/often randomized to the same arm threaten study validity) [ 15].
Women were excluded if they were unable or unwilling to provide written informed consent, unable to comfortably converse in English, or were threatening to study staff.
While population studies are less prone to selection bias, low study response rates and selective participation can result in non-response bias which can threaten a study's validity [ 2].
Since we intend to pragmatically study the effects of the CareWell-primary care program in comparison to 'care as usual', these facts do not threaten our study as the focus will be on the additional value of our integrated care program in comparison to 'usual care', that is conducted following the EasyCare-TOS.
While the wedge-billed woodcreeper is not currently threatened, our study was intended to illustrate how environmentally associated variation can be mapped and incorporated into conservation assessments.
But if Erbitux was shown to work on its own, it would undermine the rationale behind the main study, threatening approval of the drug.
Marked elevations of serum aminotransferases (exceeding 1,000 IU/l) were observed in some human subjects receiving Entolimod in a safety study, threatening its continued development.
Not able or unwilling to complete questionnaires 3. Relevant health threatening event during study which avoids further participation 4. Death of the resident Those who meet the inclusion criteria are asked to subscribe the informed consent provided by the investigators to participate in the project.
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