Step I Understanding Public Health in STEP 1?

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Cheerios5789

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I am studying Public Health in STEP 1, in a course I am taking on it in USMLE-Rx.

I'm having a bit of trouble understanding:
  • Sensitivity
  • Positive Predictive Value
  • Negative Predictive Value
Can someone please point me in the direction of additional materials that may have help you understand these concepts?