. Twenty thousand children who were obese were enrolled in a cohort study in January 2010. Four hundred children were diagnosed with disease at the start of the study and were not included in the study. The remaining children were followed to see if they developed diabetes.During 2010, 120 students were diagnosed with diabetes and 50 students were lost to follow-up. The next year, 100 students were diagnosed with diabetes and 80 were lost to follow-up. In 2012, 125 students were diagnosed with diabetes and 75 students were lost to follow-up. In 2013, 85 students were diagnosed with diabetes and 165 students were lost to follow-up. In the last year of the study, 125 students were diagnosed with diabetes and 225 were lost to follow-up.

1a. Complete the following table using the information in the above paragraph. Assume that children who were diagnosed with diabetes or lost to follow-up contributed 6 months in the year when they were diagnosed or lost to follow-up. Remember to show your work.

Number of children who started the year

Number of cases

Number of lost to follow up

Number of Children who ended the year disease free

person time

Year

2010

2011

2012

2013

2014

Total

1b. Calculate the incidence density (per 10,000 person-years) of diabetes during the five-year study? Show your work. (0.5 points)

1c. Calculate the prevalence of diabetes (%) at the end of 2011? Show your work. (0.5 points)