system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
In a study, group of smokers followed up for 10 years to find incidence of a cancer. What type of study design is this?
assistant
The correct answer is  Types of coho study: 1. Prospective/Concurrent Coho Begin in present and continue to future Outcome has not yet occurred at the time the investigation begins 2. Retrospective/Historical coho Outcomes have occurred before sta of investigation Investigator goes back in time to select study groups from existing records of past employment , up to the present 3. Ambidirectional/mixed coho Combination of retrospective and prospective coho studies