Please answer the questions below to test your understanding of confidence intervals.
- Confidence intervals can be used to assess both clinical and statistical significance - true or false?
- In a trial comparing a new treatment for breast cancer with established treatment, the relative risk of recurrence within 5 years was 0.88 (95% CI 0.73 – 1.09). Has the new treatment shown a statistically significant benefit?
- In a trial comparing the effect of an osteoporosis treatment with placebo on prevention of hip fracture, the number needed to treat (NNT) was 38 (95% CI 23 – 560). Has the treatment shown a statistically significant benefit?
- In the osteoporosis trial above, has the treatment shown a clinically significant effect?