10,000 New York City Road Runner members were surveyed and classified based on t
ID: 3146349 • Letter: 1
Question
10,000 New York City Road Runner members were surveyed and classified based on the number of hours per week that they ran. The runners were classified as "Running more than 10 hours per week" and Running less than 10 per week." Runners were then followed for the next five years to determine which runners develop stress fractures: Incidence Rates of Stress Fractures per 1,000 Runners 0.28 0.63 Running less than 10 hours per week Running more than 10 hours per week a. What type of study is this? b. Calculate the relative risk of developing stress fractures associated with running more than 10 hours per week: c. Describe in your own words how you would interpret this result: d. Calculate the attributable risk of stress fractures associated with running more than 10 hours per week e. Describe in your own words how you would interpret this result f. Calculate the attributable risk percent- g. Describe in your own words how you would interpret this result g. Describe in your own words how you would interpret this resutExplanation / Answer
a. The Study is a type of "observational study"
b. Relative Risk = 0.63/0.28 = 2.25
c. Here, there are 2.25 times more risk of stress frature in runners who run 10 hours per week than who run less than 1 hours per week.
d. Attributable risk = 0.63 - 0.28 = 0.35 per 1000 runners
e. Here, we can interpret that there is 0.35 per 1000 runeners less riskn in incidence of streee fracture that would be observed if the population were entirely unexposed, compared with its current (actual) exposure pattern.
f. Attributable risk percent = (0.63 - 0.28)/ 0.63 * 100 = 55.55%
g. There are 55.55% less risk of stress fracture in runners who run less than 10 hours a week as compared to runners who run more than 1 hours per week.
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