COMLEX-1 and USMLE-1 are not interchangeable examinations.

Area of Science:

• Medical Education
• Licensing Examinations
• Emergency Medicine

Background:

• Osteopathic medical students must pass the COMLEX-USA, but not USMLE-1.
• Limited data exist on the comparability between COMLEX-1 and USMLE-1 scores.
• Understanding score comparability is crucial for residency applications.

Purpose of the Study:

• To assess if COMLEX-1 scores predict USMLE-1 scores in osteopathic medical students applying to emergency medicine (EM) residencies.
• To determine the interchangeability of COMLEX-1 and USMLE-1 scores.

Main Methods:

• Retrospective analysis of 90 osteopathic medical students applying to EM residency (2005-2007).
• Inclusion criteria: completion of both COMLEX-1 and USMLE-1.
• Statistical analysis included linear regression and Bland-Altman plots.

Main Results:

• A strong correlation (0.79) was found between COMLEX-1 and USMLE-1 scores.
• COMLEX-1 scores explained 62.3% of the variance in USMLE-1 scores (R² = 0.623).
• Bland-Altman analysis indicated scores are not interchangeable.

Conclusions:

• COMLEX-1 scores do not fully predict USMLE-1 performance.
• The scores are not interchangeable for evaluating EM residency candidates.
• Further research is needed to establish precise score equivalencies.