Methods of organizing medical data include hierarchically relating a single type of medical or research event to medical data generated from the single type of medical or research event in a computer database environment. Organizing the data in this way enables a researcher to access medical data collected as part of a medical procedure performed on a large number of patients, but at different times. For example, the medical data may be viewed in a more hierarchical fashion, thereby enabling the researcher to further investigate potential relationships between other factors.