Summarizing of assessments
Of the 330 questionnaires distributed, 329 were returned (99.7% return rate), among which 327 were valid (99.1% completion rate). Two were invalid because they were completely blank. Of the 329 exams issued, 327 were returned (99.4% return rate) and all were valid (100% completion rate). In the control group, one student left before completing the questionnaire. One student in each group withdrew from the study for personal reasons before completing the knowledge exam. The final analysis included 327 undergraduates with complete data, 162 in the intervention group and 165 in the control group (Fig. Flowchart of the study.