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Sample size formulas exist and can safely be applied for many trial designs and statistical tests.
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Many clinical trial designs remain conservative and there is no established standardised methodology for recruiting more elderly patients with co-morbidities and disability into clinical trials.
Many older trial designs do not detail statistical software or programming applications as being readily available, and where not detailed in the manual, we specifically encourage authors to make such software publicly available.
It is considered by some to be inconvenient and many of the trial designs have been limited by the fact that the control arm is not the standard of care, i.e. IV carboplatin and paclitaxel.
Although several small clinical trials suggest benefits of urate-lowering therapies on kidney function, blood pressure, and insulin resistance, others have been negative, with many trials having design limitations and insufficient power.
Some of the included studies keep low-quality because many trials have design limitations.
It is absolutely essential that trial designs incorporate many ECG recordings, consistent QT interval measurement, and appropriate control or correction of the QT interval for heart rate in order to provide reproducible, scientifically meaningful results.
Many challenges in trial design and execution are evident from the studies reviewed.
In comparison to adults, paediatric multiple sclerosis is rare, which creates many challenges for trial design.
On a real dataset of adolescent girls, the PPI methods appeared to have greater sensitivity in detecting task-modulated FC when using a block design and the beta series method appeared to have greater sensitivity when using an event-related design with many trial repetitions.
Many intervention trials designed to improve medication adherence have targeted adults with adherence problems.
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