One hundred and forty-four medical students were enrolled in the study, the participants were randomly divided into experimental group and control group with 72 in each. All students attended the theoretical lecture of general medicine. Students in experimental group took part in the extracurricular teaching activities including the nutritional course and practice, the clinical case study and problem based learning ( PBL), students in control group did not have the extracurricular activities. The results showed that although there was no difference in general testing scores between two groups, the problem solving ability and assay-writing ability of experimental group were significantly higher than those of control group.
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