Suppose that you are funded to engage in a study of chronic obstructive pulmonary disease (COPD) in a fixed population of 2,000 people. The study lasts three years (January 1, 2012 - December 31, 2014). At the beginning of the study 15 people are identified as already having COPD. Ten additional people diagnosed with COPD during 2012, and three of those ten died during 2012. Seven people were diagnosed with COPD in 2013 (two of them died same year), and eight people developed the disease in 2014 (three of them died).

What is the point prevalence rate (per 1,000) of COPD on January 1, 2012?

What is the point prevalence rate (per 1,000) of COPD on January 1, 2013?