Item analysis
Item analysis was performed on both the immediate and delayed tests by calculating item difficulty and discrimination indices. In the immediate test, the mean difficulty and discrimination indices of 10 items in the liver test were 0.72 and 0.52, respectively, while they were 0.56 and 0.47 in the genitalia test. In the delayed test, the mean difficulty and discrimination indices of 19 items in the genitalia test were 0.51 and 0.43, respectively, while they were 0.42 and 0.62 in the liver test, respectively.In the immediate test, Cronbach’s alpha value was 0.70 in the liver test, and 0.78 in the genitalia test. In the delayed test, the value was 0.69 in the liver test, and 0.72 in the genitalia test. All of the values are above of or close to the acceptable level, which is 0.70.