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
Calculate the prevalence if incidence is 2 cases per 1,000 population per year and mean duration is 4 years-
assistant
The correct answer is  prevalence is calculated as the product of incidence and mean duration of a disease in a community.during a specific period,here it is given as 4 *2 cases per 1000 population. ref:park&;s textbook,ed 22,pg no 67