You are conducting a study to compare chances of injury between machine-users and free-weight users in the gym, assuming that a gym member can only be injured in the gym once in his/her lifetime. 1500 gym members across the county were polled beginning 1/1/2015.On June 5, 2015, it was discovered that 75 of those gym members currently had gym-related injuries.After June 5, the remaining injury-free members were enrolled in a cohort study, classified as machine-users (n=1000) and free-weight users (n=425), and followed for 3 years.85 machine-users and 15 free-weight users became injured in the 3 years.All follow-up stopped on exactly June 5, 2018.

Question 1: To calculate the point-prevalence of injury on June 5, 2015, you need to use