USMLE purpose: Rapid-review a single biostats shortcut in Anki-card style.

How to use this page

1. Recall the no-effect value.
2. Check the confidence interval.
3. Decide whether the result is significant.

• Episode metadata

One-liner

For RR, OR, and HR, a confidence interval that crosses 1 is not statistically significant.

• Rapid recall: RR 0.8 with CI 0.6–1.2?
• Mini-check

Extra practice

A hazard ratio is 0.75 with 95% CI 0.50–1.20. Is the result statistically significant?

• Reveal answer & explanation