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. 2013 Oct 8;13:139. doi: 10.1186/1472-6920-13-139

Table 1.

Comparison of performance between participants and non-participants in previous exams

Year of study Participants (mean ± SD) Non-participants (mean ± SD) T-Test
Year 2
56.2 ± 11.7
55.0 ± 10.6
0.56
Year 3
69.0 ± 8.0
66.0 ± 6.4
0.20
Year 4
59.1 ± 8.4
57.0 ± 11.0
0.29
Year 5 70.6 ± 7.1 70.5 ± 6.7 0.70