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

How to use this page

1. Try to answer the one-liner from memory.
2. Open the toggle to check yourself.
3. Use this as a quick pre-block warmup.

• Episode metadata

One-liner

When a biostats short asks for a metric, name the metric before doing math.

• Rapid recall: positive test → truly disease?
• Mini-check

Extra practice

A patient has a positive screening test. Which denominator belongs to PPV?

• A) Everyone with disease
• B) Everyone without disease
• C) Everyone with a positive test
• D) Everyone with a negative test
• Reveal answer & explanation