Which statement best describes a limitation of physician practice data?

• A. Limited application
• B. Code of confidentiality and privacy restrictions
• C. Highly representative of the general population
• D. It provides broad generalizability

Answer: (B)

Confidentiality and privacy restrictions are a primary limitation of physician practice data. Patient information is protected by laws and ethical standards, so researchers must work under strict data-use agreements, and data are often de-identified or access-limited. This reduces the amount of usable detail, makes it harder to link records across multiple visits or to combine with other data sources, and can force researchers to work with dates or identifiers that are less precise. As a result, certain analyses—like tracking long-term outcomes or performing longitudinal linkage—become more difficult or even impossible, which constrains what you can learn from the data. The other statements don’t accurately describe the main limitation: physician practice data aren’t generally expected to be broadly generalizable to the whole population, and saying they have broad generalizability or limited application doesn’t capture the concrete impact of privacy rules.