Table 2.

Correct answers in pre-tests and post-tests

Group	Pre-test	Post-test	Improvement	Cohen's d
1a (eCases, level 1)	22% (21–23%)	88% (86–91%)	66% (63–69%)	14.23
1b (eCases, level 2)	22% (20–23%)	92% (91–94%)	70% (68–73%)	19.78
1c (eCases, level 2+)	22% (21–23%)	94% (92–95%)	71% (68–73%)	18.24
2a (eTextbook, level1)	23% (21–24%)	66% (64–68%)	43% (41–45%)	10.51
2b (eTextbook, level 2)	22% (21–24%)	70% (68–73%)	48% (46–50%)	10.76
2c (eTextbook, level 2+)	22% (20–23%)	71% (68–74%)	49% (46–53%)	9.71

Values are relative numbers of correct answers for each type of educational content in each group, with 95% confidence intervals in brackets. p <0.05 for all of the following comparisons: 1a (eCases) vs. 2a (eTextbook); 1b (eCases) vs. 2b (eTextbook); 1c (eCases) vs. 2c (eTextbook). Mann–Whitney U test for all comparisons. N=20 in each group. Cohen's effect size value (d): high (>0.8), moderate (0.5–0.8), or small (0.2–0.5) practical significance.