[Expert Solution]: Cohort Study – Data for the cohort study…

Cohort Study – Data for the cohort study was obtained from records obtained from the ministry of labor which maintained records on all individuals who were employed in Denmark and Sweden, Researchers recorded occupational data for all subjects between 1955 to 1965. Patients with lung cancer were identified from registries listing hospitalizations reported annually to the centralized Swedish Inpatient and the nationwide Danish Hospital Discharge Registers. (Hospitalizations were from nationwide data for Denmark and also included a proportion of Swedish hospitals ranging from 65% to 85% between 1966 and 1983). Each record in these registries includes the patient’s unique national registration number, date of birth, dates of admission and discharge, discharge diagnoses, and surgical procedures. Subjects with multiple admissions during these time periods have multiple records. The individual registration numbers are assigned to all Swedish and Danish residents a short time after birth. Registration numbers were used to link Swedish patients whose hospital discharge diagnoses included lung cancer to the Swedish Registry of Causes of Death, the Registry of the Total Population, The Registry of Population Migration, and the National Swedish Cancer Registry. Similarly, the cohort of hospitalized Danish individuals diagnosed with lung cancer. What makes the second study a cohort study?