There were 300 students entering a 9th grade class at the beginning of the acade

Question

There were 300 students entering a 9th grade class at the beginning of the academic year 80 of those 300 were obese as they entered 9th grade 2 non-obese students had already been diagnosed with Type II diabetes prior to entering the 9th grade. 8 obese students had already been diagnosed with Type II diabetes prior to entering the 9th grade. Of the non-obese students that hadn’t been diagnosed with Type II diabetes prior to entering the 9th grade, only 1 developed Type II diabetes during 9th grade. Of those obese students that hadn’t been diagnosed with Type II diabetes prior to entering the 9th grade, 13 developed Type II diabetes during 9th grade. All 300 students were observed for the entirety of the 9th grade school year, no new students joined the class during the year, and obesity status did not change for any students over the course of the school year.

Refer to this information for questions 32-33.

Question 32

Calculate the incidence of Type II diabetes among obese students over the 9th grade school year. Express your answer as a percent (%) rounded to the nearest whole number

Question 33

On the last day of the 9th grade school year, what was the prevalence of obesity in the 9th grade class? Express your answer as a percent (%) rounded to the nearest whole number

Explanation / Answer

32. Incidence of type II diabetes among obese stdents over the course of 9th grade = Number of new case reported among the obese students/population of obese students at risk

= 13/(80 - 8)

= 0.18 = 18%

33. Prevalence of obesity in 9th grade class = Number of obese students/Total number of students

= 8/80

= 0.1 = 10%

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