Module 4
Reading the Numbers
Interpreting results honestly: gross versus net savings, statistical significance and magnitude, and whether a result generalizes.
By the end of this module, you will be able to:
- Calculate net savings from gross savings, shared-savings payouts, and program costs
- Interpret a confidence interval alongside the practical size of an estimated effect
- Judge whether a result is likely to transfer to a different population or era
- Gross vs Net Savings The single most important distinction in value-based evidence, and the one most often blurred. This lesson makes it concrete. About 5 min
- Significance, Uncertainty, and Magnitude A result can be statistically significant and trivial, or promising and uncertain. This lesson covers how to read the numbers around the number. About 5 min
- Generalizability A result that is true in one place, time, and population may not travel. This lesson covers when evidence transfers and when it does not. About 4 min
Module quiz
Answer all questions to see your score.
1. A program cuts medical spending by $200M but pays $150M in shared savings and costs $80M to run. Net result to the payer?
Gross savings can be real while net savings are negative; net subtracts payouts and program costs.
2. A study reports savings of 0.4 percent that are 'not statistically significant.' Best reading?
Not significant means the data cannot distinguish the result from zero; it is an absence of clear evidence, not proof of failure.
3. A bundle saved money for elective joint replacements. Safest conclusion?
Evidence generalizes best to similar conditions, populations, and eras; predictable surgical episodes are not medical or emergency ones.