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
Midyear population is considered as that on
assistant
The correct answer is  The mid-year population is used to calculate bih and death rates. The mid-point refers to the population estimated as on first of July of a year.Park 23e pg: 55