Review Question - QID 1074

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Statistic Definitions Relative Risk Definition QID: 1074 (OBQ05.188)

QID 1074 (Type "1074" in App Search)

A prospective cohort study is performed looking at the relationship between blood transfusions and the risk of developing hepatitis C. In the transfused group (study group) of 595 patients, 75 patients develop hepatitis C. In the non-transfused group (control group) of 712 people, 16 people contract hepatitis C. What is the relative risk of developing hepatitis C with a transfusion.

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Incidence of study group (75/595) divided by incidence of control group (16/712)

77%

1410/1824

Incidence of study group (16/595) divided by incidence of control group (75/712)

86/1824

Prevalence of study group (75/595) divided by prevalence of control group (16/712)

14%

248/1824

Prevalence of study group (16/595) divided by prevalence of control group (75/712)

26/1824

Total infected (75+16) divided by total population in study (595+712)

36/1824

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Relative risk is the risk of developing disease for people with known exposure compared to risk of developing disease without exposure. It is calculated by dividing the incidence of the study group by the incidence of the control group.

The cited Kocher article details commonly used statistics in orthopedic research.

Clinical epidemiology and biostatistics: a primer for orthopaedic surgeons.

Mininder S Kocher,

David Zurakowski

Basic Science
- Statistic Definitions

Mininder S Kocher, JBJS 2004

...

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