Figure 1.

Knowledge Assessment by User Group

Note: Mean knowledge scores at pretest, posttest, and follow up-test for high (> 25 self-performed examinations) and low (< 25 self-performed examinations) utilizers. Mean scores for all users were significantly different at all 3 assessments (P < .001). High utilizers scored significantly higher than low utilizers at the pretest assessment (66.2% versus 60.5%, P = .029), but mean knowledge scores between groups were not significantly different at any other assessment.