A case control study of injuries involving moped riders was conducted in Spain.

A case control study of injuries involving moped riders was conducted in Spain. The authors obtained information from the Spanish Registry of Traffic Crashes regarding 187,353 moped riders injured in traffic accidents between 1990 and 1999. They then compared the group with head injuries (cases) with those with other types of injury (controls). The following data were obtained:

 

 

 

Driver

 

Passenger

 

Total

 

 

 

Head injury

 

Other injury

 

Head injury

 

Other injury

 

Head injury

 

Other injury

 

No helmet

 

17,869

 

51,900

 

3,052

 

12,522

 

20,921

 

64,422

 

Helmet

 

7,342

 

86,212

 

485

 

7,971

 

7,827

 

94,183

 

 

 

25,211

 

138,112

 

3,537

 

20,493

 

28,748

 

158,605

 

Answer the following questions using this data. Enter only your final answer do not enter your working. Note: You must enter your answers to 2 decimal places eg 9.41.

 

What is the crude odds ratio for the association between not wearing a helmet (exposed) and head injury?

 

Answer: 

 

 

 

Question 3

 

 

 

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What is the odds ratio for the association between not wearing a helmet and head injury among  moped drivers? 

 

Answer: 

 

 

 

Question 4

 

 

 

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What is the odds ratio for the association between not wearing a helmet and head injury among  moped passengers? 

 

Answer

 

 

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