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Randomized and nonrandomized controlled trial studies on PBL use in Chinese undergraduate medicaleducation were retrieved through PubMed, the Excerpta Medica Database (EMBASE), Chinese NationalKnowledge Infrastructure (CNKI) and VIP China Science and Technology Journal Database (VIP-CSTJ) withpublication dates from 1st January 1966 till 31 August 2014. The pass rate, excellence rate and examinationscores of course examination were collected. Methodological quality was evaluated based on the modifiedJadad scale. The I-square statistic and Chi-square test of heterogeneity were used to assess the statisticalheterogeneity. Overall RRs or SMDs with their 95% CIs were calculated in meta-analysis. Meta-regression andsubgroup meta-analyses were also performed based on comparators and other confounding factors. Funnelplots and Egger's tests were performed to assess degrees of publication bias.
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