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Table 2 Difference in knowledge scores before and after exam

From: How does participation in a voluntary prize exam affect medical students’ knowledge and interest in ENT, plastic surgery, ophthalmology and dermatology?

Knowledge scores (mean)  
  Before exam After exam Difference
ENT 3.9 6.4 + 2.5
Plastic Surgery 1.8 4.9 + 3.1
Ophthalmology 4.0 5.7 + 1.7
Dermatology 4.1 6.1 + 2.0