A 95% confidence interval for a relative risk is 0.8 to 1.6. What is the most appropriate interpretation?
Correct answer: C. The interval includes no difference between groups
- A. The association is statistically significant at 5%
- B. The relative risk is exactly 1.2
- C. The interval includes no difference between groups
- D. The exposed group has no disease cases
Explanation
For a relative risk, a value of 1 represents no difference between groups, and this interval includes 1. Therefore, the result is not statistically significant at the 5% level based on this interval.
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Epidemiology examines the distribution and causes of disease by person, place and time, using measures such as incidence, prevalence, mortality and case-fatality rates. Biostatistics covers data presentation, sampling, averages, variability, probability and interpretation of study results, while distinguishing association from causation.
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