Oh joy, I suspected that your comments were based on thoughtful scientific inquiry.
I am quite intrigued at this point and would love to hear further about what you think the many reasons that non-trad's do worse (or better) on the USMLE exams. Please elaborate.
Here are a few initial thoughts regarding USMLE exams and non-traditional students.
Possible reasons for scoring worse:
1. Many years gap in full time education between undergad or grad school and med school could result in reduced proficiency on standardized tests.
2. Older students tend to be more experiential learners who "learn by doing" rather than "learn by lecture" which is the case at many medical schools' basic science curriculum
3. Family obligations and responsibilities take time away from studying
Possible reasons for scoring better:
1. years of experience, esp. in medically related fields such as nursing or allied health, make it easier to comprehend and retain the clinical relevance of the material that is presented.
2. older students are possibly more disciplined in their study schedule/habits compared to a traditional student
3. older students are better able to discern which material is most likely to be tested and which material is less testable
4. older students are more accustomed to performing in stressful situations, and therefore suffer less test anxiety
I'm sure thoughtful inquiry could come up with many additional reasons in each category.
Anyway, I 'm not sure I have the time or the inclination to design a study and follow through with it (maybe someday). I just think it is an interesting question to consider in threads like this one.