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Learning and retention from an online tutorial among resident physicians.

We randomized 91 residents who completed an online diabetes tutorial to take a post-test after 0, 1, 3, 8, 21, or 55 days. 87 subjects provided complete follow-up data (96%). Knowledge scores were 2.5 standard deviations above baseline for those tested immediately; gains were half as great after 8 days; no retention remained at 55 days. In linear regression modeling, critical appraisal skills and time spent on the interactive tutorial correlated with greater learning.