Define retrospective studies.

Define retrospective studies.

• A. Studies that look to the past, often chart reviews
• B. Planned data collection going forward
• C. Following subjects over time
• D. Randomized controlled trials

Answer: (A)

Retrospective studies analyze data from the past, using existing records to examine exposures and outcomes that have already occurred. They’re observational and rely on information that has already been collected, often through chart reviews, medical records, or databases. This backward-looking approach contrasts with prospective studies, where data are collected going forward from the start, and with randomized controlled trials, which involve assigning interventions. While cohort designs can be retrospective or prospective, the defining feature here is using already-recorded information to study past events.

Retrospective studies analyze data from the past, using existing records to examine exposures and outcomes that have already occurred. They’re observational and rely on information that has already been collected, often through chart reviews, medical records, or databases. This backward-looking approach contrasts with prospective studies, where data are collected going forward from the start, and with randomized controlled trials, which involve assigning interventions. While cohort designs can be retrospective or prospective, the defining feature here is using already-recorded information to study past events.