You are asked to evaluate a STI (Sexually Transmissible Infections) Prevention Education program in the Philadelphia School District. The program has been in operation for five years (January 1, 2008 to December 31, 2012) and data collection had been on-going. You note that the quality of the data is high (i.e., current, reliable and accurate). Choose from the following the best measure that you would choose to evaluate the effectiveness of the program. B
A. Point prevalence rate of STI in the years 2008, 2009, 2010, 2011 and 2012
B. Period prevalence rate of STI from 2008 through 2012
C. Annual incidence rate of STI during the period 2008 through 2012
D. Incidence rate of STI in 2012.