Many large integrated delivery networks have a common electronic medical record system… A researcher wants to determine if the clinical outcomes for a chronic disease over a three-year period are better… Which research methodology will achieve this goal?

A randomized control trial (RCT) involves assigning participants randomly to either a treatment or control group to assess the effects of an intervention. While RCTs are considered the gold standard for evaluating interventions, they are not suitable for determining outcomes over an extended period in existing patient populations without a manipulation of the treatment.

A case study involves an in-depth analysis of a single case or a small number of cases, providing detailed qualitative insights. However, this approach does not allow for a comprehensive assessment of clinical outcomes across a larger group or over a specified timeframe, limiting its generalizability and applicability to broader populations.

A pre/post-study design assesses outcomes before and after an intervention within the same group. While it can provide valuable insights, it lacks the longitudinal aspect of tracking a cohort over time, making it less effective for analyzing clinical outcomes related to chronic diseases across a three-year period without a control group.