CCDM Data Collection Methods 5 — Questions and Answers
Question 1: Which type of data collection error occurs when a site coordinator records '120/80' in the diastolic blood pressure field instead of the systolic field?
- Omission error
- Transposition error
- Field placement error (Correct answer)
- Truncation error
Correct answer: Field placement error
Placing data in the wrong field is a field placement error, distinct from transcription or omission errors.
Question 2: What is the function of a Data Management Plan (DMP) in relation to data collection?
- It defines the statistical significance thresholds for the trial
- It outlines the processes, tools, responsibilities, and timelines for managing clinical data throughout the trial (Correct answer)
- It specifies the randomization seed and algorithm
- It serves as the protocol amendment log
Correct answer: It outlines the processes, tools, responsibilities, and timelines for managing clinical data throughout the trial
The DMP is the comprehensive document that governs all data management activities including collection methods, timelines, and quality controls.
Question 3: In risk-based data collection, which factor would MOST increase the monitoring intensity for a particular data point?
- The data point is collected at a single time point
- The data point is the primary safety endpoint with direct patient impact (Correct answer)
- The data point is collected by an experienced investigator
- The data point is redundantly captured in two separate fields
Correct answer: The data point is the primary safety endpoint with direct patient impact
Data points that are primary safety endpoints with direct patient impact are classified as high-risk and require more intensive monitoring.
Question 4: When a clinical trial uses a central laboratory, which data collection step ensures that lab results are correctly attributed to the right patient and visit?
- Protocol version tracking
- Proper specimen labeling with unique subject and visit identifiers (Correct answer)
- Investigator signature on the lab requisition
- IRB approval of the central lab contract
Correct answer: Proper specimen labeling with unique subject and visit identifiers
Unique specimen labels containing subject ID and visit information are critical to ensuring correct attribution of laboratory results.
Question 5: Which approach to data collection helps ensure that endpoints derived from imaging studies are assessed consistently across all trial sites?
- Allowing each site radiologist to apply their preferred criteria
- Using a central independent review committee with predefined assessment criteria (Correct answer)
- Collecting imaging data only at the coordinating center
- Permitting investigators to convert imaging results to narrative summaries
Correct answer: Using a central independent review committee with predefined assessment criteria
Central independent review committees apply uniform, pre-specified criteria to imaging data, reducing variability and bias across sites.
Question 6: A data manager notices that a site has submitted CRFs with dates written in MM/DD/YY format while the protocol requires DD/MMM/YYYY. What is the BEST course of action?
- Accept the data as submitted since the intent is clear
- Issue a query requesting the site to confirm and correct the dates to the required format (Correct answer)
- Automatically convert all dates during database lock
- Notify the IRB immediately
Correct answer: Issue a query requesting the site to confirm and correct the dates to the required format
Issuing a query to the site ensures that dates are confirmed and corrected in the proper format, maintaining data integrity and audit trail.
Question 7: What is the significance of capturing 'not done' versus leaving a field blank in a clinical CRF?
- Both represent the same missing data scenario and can be used interchangeably
- 'Not done' indicates the assessment was intentionally skipped, while a blank may indicate a data entry omission (Correct answer)
- A blank field triggers an automatic protocol deviation
- 'Not done' entries are excluded from all statistical analyses by default
Correct answer: 'Not done' indicates the assessment was intentionally skipped, while a blank may indicate a data entry omission
Distinguishing 'not done' from a blank field preserves the reason for missing data, which is critical for statistical analysis and regulatory review.
CCDM Data Collection Methods 5
Which type of data collection error occurs when a site coordinator records '120/80' in the diastolic blood pressure field instead of the systolic field?