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Table 3 New distribution of the difficulty level of the questions for both groups

From: The Sandwich principle: assessing the didactic effect in lectures on “cleft lips and palates”

 

Difficulty level

Sandwich lecture

Number of questions

Classical lecture

Number of questions

Easy

>  0.8–1

12

7

Upper test optimum

0.8–0.6

10

5

Lower test optimum

0.5–0.4

8

12

Difficult

< 0.4

10

16