Your study enrolls 10,000 adults age 218 years old between 2004-2005 who present

Question

Your study enrolls 10,000 adults age 218 years old between 2004-2005 who present at one of the Department of Motor Vehicles office throughout NJ for license renewal, first time licenses, registratiorn services, etc. You conduct follow-up on these individuals for 5 years after enrollment. Information on cause of death is ascertained by reviewing death certificates, records from the Medical Examiner's office, etc. At the end of the study, you have accumulated the following data n-180 total motor vehicle related deaths; among these 180 deaths, n=100 were due to driving in excess of the speed limit, n-45 deaths due to driving while intoxicated and n-35 deaths due to other, unidentified reasons (important note: all of these causes of death are mutually exclusive). You are able to construct the following two 2x2 tables with your cohort study data: Table 1: Deaths related to driving speed: Died Not dead Driving in excess of the 100 1900 2,000 speed limit Driving within speed limit 80 7920 8,000 180982010,000 Table 2: Deaths related to driving while intoxicated (DWI) DWI No DWI Died 45 135 Not dead 255 9565 300 9,700 10,000 1809820 Measures of Association 1. What is the overall motor vehicle related mortality risk in this sample? 2. Based on data in Table 1, calculate the following: Risk of death among those who were driving in excess of the speed limit a. b. Risk of death among those who were driving within the speed limit The cumulative incidence ratio of automobile-related death by driving speed c. 3. Based on data in Table 2, calculate the following: a. b. c. Risk of death among those who were DWI (exposed) Risk of death among those who were not DWI (unexposed) The cumulative incidence ratio of automobile-related death by DWI status

Explanation / Answer

1. overall motor vehicle related mortality risk = 180 / 10000 = 0.18%

2.

a. Risk of death among those who were driving in excess of speed limit = 100 / 2000 = 5%

b. Risk of death among those who were driving within speed limit = 80/ 8000 = 1%

c. Cumulative Incidence Ratio of automobile related death by driving speed = 100 / 10000 = 1%

3.

a. Risk of death among those who were DWI = 45 / 300 = 15%

b. Risk of death among those who were not DWI = 135 / 9700 = 1.39%

c. Cumulative Incidence Ratio of automobile related death by DWI= 45 / 10000 = 0.45%

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