Table 2. Difference between scores on practice tests and Step 1 scores.
*Average difference refers to the average of the differences between each student’s USMLE Step 1 score and their NBME or UWorld practice test
NBME: National Board of Medical Examiners; UWSA: UWorld Self Assessment; USMLE: United States Medical Licensing Examination
| Test Name | Average practice test score | Average Step 1 score | Average difference* | Responses, n |
| NBME 13 | 222.0 | 250.1 | 28.6 | 64 |
| NBME 15 | 222.4 | 247.3 | 25.4 | 73 |
| NBME 16 | 230.1 | 248.8 | 19.1 | 123 |
| NBME 17 | 233.9 | 248.2 | 17.1 | 130 |
| NBME 18 | 236.1 | 246.9 | 12.8 | 333 |
| NBME 19 | 233.4 | 249.7 | 19.5 | 64 |
| NBME 20 | 228.1 | 248.1 | 20.7 | 242 |
| NBME 21 | 231.5 | 247.1 | 16.8 | 280 |
| NBME 22 | 235.4 | 248.7 | 14.8 | 188 |
| NBME 23 | 235.7 | 248.3 | 13.8 | 163 |
| NBME 24 | 237.4 | 247.4 | 11.9 | 166 |
| UWSA 1 | 248.1 | 246.7 | 10.5 | 360 |
| UWSA 2 | 248.2 | 246.7 | 6.9 | 369 |