Data reliability means that data are

• A. Data are consistent no matter how many times the same data are collected and entered into a system
• B. Data are encrypted and anonymized
• C. Data are linked to patient identifiers
• D. Data are stored in a data warehouse

Answer: (A)

Reliability in data quality means that data are consistent and repeatable. If you collect the same data multiple times or enter them into a system again, you should obtain the same values. This consistency is essential for trustworthy reporting, comparisons over time, and making confident clinical and operational decisions.

Encryption and anonymization protect privacy, not the consistency of data values. Linking data to patient identifiers speaks to traceability and privacy or data integration, not whether the data remain the same across repeated collection. Storing data in a data warehouse relates to where data live and how they are organized, not how consistently the data behave when re-collected or re-entered.