Figure 1

Comparison of the practice test scores at the end of the clerkship. The test scores of each group are represented by a thick solid line. The comparison between the test scores of every two groups is explained with a comment on a dotted line. In the comment for each solid line, Mean stands for the mean score of the corresponding group, while SD stands for the standard deviation. Each solid line centers on Mean and stretches from (Mean – SD) to (Mean + SD). The longer the solid line is, the bigger the SD the corresponding test scores have. For each dotted line, its comment states the t-test result. If the result indicates significant difference (P < 0.05), the calculated effect size is also presented. The effect size can be either positive or negative. A positive effect size indicates positive difference in the direction of the arrow.