Identify the exposure variable and the outcome variable.

• Determine if the given problem is a cohort study.
• If the study is a cohort, identify if the design is prospective or retrospective.
• Also, identify the exposure variable and the outcome variable.
• If data is provided, perform simple analysis on the data and interpret the results.
• If the study is not a cohort, justify it by identifying and describing the key points why it is not a cohort study.

A group cooperative in City A is a consumer-owned cooperative founded in 1945. In 1978, study was done wherein women who were aged 50-64 at the time of the study were identified. 8 women were excluded from the study because of a prior history of breast cancer. Their use of conjugated estrogens was obtained using computerized prescription records. From 1978 to 1984, women hospitalized with pathologic diagnosis of fibrocystic breast disease were identified.