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. 2015 Mar 30;10(3):e0120884. doi: 10.1371/journal.pone.0120884

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© 2015 Zhang et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Fig 2 — Events: “pass” events, M-H: Mantel-Haenszel, PBL:PBL teaching model independently applied to the experimental group, PBL+LBL: PBL+LBL teaching models applied to the experimental group, LBL: LBL teaching model applied to the control group.