The median and range of time from query generation to resolution is a direct and ongoing measure of a clinical site's operational responsiveness and efficiency. This metric, often called "query turnaround time," specifically evaluates how quickly site staff address and resolve data discrepancies. It is a key performance indicator (KPI) for the timeliness of the site's day-to-day data-related tasks throughout the conduct phase of a trial. A shorter and less variable resolution time indicates a high-performing, engaged site, which is crucial for maintaining data integrity and meeting overall study timelines.

A. Time from Last Patient Last Visit to database lock: This metric measures the overall study close-out process, which involves the sponsor, CRO, and biostatistics, not just the site's performance.

B. Time from final protocol to first patient enrolled: This measures the entire study start-up cycle, heavily influenced by sponsor, CRO, and regulatory body timelines, not solely the site's work.

C. Time from site contract execution to first patient enrolled: This is a site start-up metric, but it is also dependent on external factors like Institutional Review Board (IRB) approval timelines.

1. Society for Clinical Data Management. (2023). Good Clinical Data Management Practices (GCDMP). Section 11.3, "Process Metrics," discusses the importance of tracking metrics related to the data management lifecycle, including query rates and resolution times, to monitor performance.

2. Mitchel, J., Kim, Y. J., Choi, J., & Park, J. (2011). Metrics for Clinical Trials: A CRO Perspective. Therapeutic Innovation & Regulatory Science, 45(4), 389–399. Table 1 (p. 391) lists "Query Turnaround Time" as a key performance indicator for site management, directly measuring the timeliness of site responses.

3. El-Masri, S., & O'Donoghue, J. (2015). Key performance indicators for clinical research data management. Studies in health technology and informatics, 218, 11-16. This paper identifies query resolution time as a critical KPI for the data management process, which is a direct reflection of the site's contribution to data quality and timeliness.

4. Tudur Smith, C., et al. (2012). The trials methodological research agenda: results from a priority setting exercise. Trials, 13(32). https://doi.org/10.1186/1745-6215-13-32. The article discusses the need for efficient trial conduct, for which metrics like query resolution time are essential tools for monitoring and managing site performance.