Data Collection & Analysis Techniques Flashcards

What is a 'protocol deviation' versus a 'protocol violation' in clinical research?

Answer: A deviation is an unplanned departure; a violation is a deviation that significantly affects participant safety or data integrity

A protocol violation is a subset of deviations that significantly impacts participant rights, safety, or data integrity and typically requires expedited reporting.

In Bayesian statistics applied to clinical trials, what does the 'prior distribution' represent?

Answer: Pre-existing knowledge or belief about a parameter before observing trial data

The prior distribution in Bayesian analysis encodes existing information or beliefs about a parameter, which is then updated with observed trial data to form the posterior.

When computing a 95% confidence interval for a treatment effect, which statement is correct?

Answer: If the study were repeated many times, 95% of such intervals would contain the true effect

A 95% CI means that 95% of intervals constructed this way across repeated studies would capture the true parameter — it is a frequentist property of the method, not of this interval.

Risk-based monitoring (RBM) in clinical trials shifts the focus of monitoring to:

Answer: Identifying and mitigating critical risks to data quality and participant safety based on site performance

RBM uses a centralized, risk-prioritized approach to focus monitoring resources on the most critical risks rather than applying uniform 100% SDV.

Which of the following is a key advantage of an adaptive trial design over a traditional fixed design?

Answer: Pre-specified modifications to the trial (e.g., sample size, dose) can be made based on interim data without inflating Type I error

Adaptive designs allow pre-planned modifications using interim data while controlling Type I error through appropriate statistical methods, increasing efficiency.

A protocol requires blood samples to be processed within 2 hours of collection. If processing is delayed to 4 hours, this affects which ALCOA principle most directly?

Answer: Accurate

Sample degradation from delayed processing compromises the accuracy of the data, violating the 'Accurate' ALCOA principle.

What is the role of the Statistical Analysis Plan (SAP) in a clinical trial?

Answer: To pre-specify in detail all statistical methods, endpoints, and analyses before unblinding to prevent data-driven bias

The SAP is finalized before unblinding and specifies all analytical methods, ensuring analyses are not influenced by knowledge of outcomes.