Table 1.
Categories for confirming and excluding power, and the corresponding effect on moving toward a higher or lower post-test probability on the log10 odds scale
| Power of the argumenta | Strength | Steps on the scaleb |
|---|---|---|
| 100 (58–200) | Very strong | 2 |
| 33 (17 to 57) | Strong | 1.5 |
| 10 (6 to 16) | Good | 1 |
| 3 (2 to 5) | Weak | 0.5 |
| 1 | Useless | 0 |
aConfirming or excluding power can range between 1 and infinity. However, power is rarely 1000 or more
bIf confirming power, add the respective number of steps, if excluding power, subtract steps (unit in log10 odds)