Which aspects should the protocol’s analysis plan cover?

Which aspects should the protocol’s analysis plan cover?

• A. Only the primary endpoint, ignoring secondary endpoints.
• B. The method of subject allocation, measurement methods, hypotheses to be tested, and issues like early withdrawals.
• C. The sponsor's internal preferences only.
• D. A post hoc adjustment plan to adjust results.

Answer: (B)

The key idea is that the protocol’s analysis plan should lay out in advance how all data will be analyzed, including what endpoints will be evaluated, how measurements will be made, and how hypotheses will be tested. It isn’t enough to plan only the main outcome; the analysis plan should specify how both primary and secondary endpoints will be analyzed, what statistical methods will be used, and what populations will be analyzed (for example, intent-to-treat versus per-protocol). It also needs to address practical issues that can affect interpretation, such as how missing data and early withdrawals will be handled, how deviations from the protocol will be treated, and what sensitivity analyses are planned to assess robustness. This upfront detail is essential for maintaining trial integrity and reducing bias, ensuring that the analyses are pre-specified and reproducible, and avoiding ad hoc or post hoc decisions after data collection begins. A plan that focuses only on the sponsor’s internal preferences or that relies on post hoc adjustments would undermine objectivity and the credibility of the results, and it fails to provide a clear roadmap for evaluating all relevant outcomes.

The key idea is that the protocol’s analysis plan should lay out in advance how all data will be analyzed, including what endpoints will be evaluated, how measurements will be made, and how hypotheses will be tested. It isn’t enough to plan only the main outcome; the analysis plan should specify how both primary and secondary endpoints will be analyzed, what statistical methods will be used, and what populations will be analyzed (for example, intent-to-treat versus per-protocol). It also needs to address practical issues that can affect interpretation, such as how missing data and early withdrawals will be handled, how deviations from the protocol will be treated, and what sensitivity analyses are planned to assess robustness.

This upfront detail is essential for maintaining trial integrity and reducing bias, ensuring that the analyses are pre-specified and reproducible, and avoiding ad hoc or post hoc decisions after data collection begins. A plan that focuses only on the sponsor’s internal preferences or that relies on post hoc adjustments would undermine objectivity and the credibility of the results, and it fails to provide a clear roadmap for evaluating all relevant outcomes.