Question 1 (2 marks) An epidemiological study followed up 153 disease-free individuals for 12 months. During the follow up five individuals developed the disease after two months. Nine individuals were diagnosed at the end of six months (or at mid-point of the follow up) while three additional cases were recorded at the end of follow up. a) Please calculate the Person-time in months (1 mark). b) Calculate Incidence rate & provide answer as per 1000 person-months (1 mark)