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Table 2 Methodological quality of studies included in the meta-analysis

From: Meta-analysis on the effectiveness of team-based learning on medical education in China

First author (Publication year) Student numbers Randomization Blind Allocation concealment Control for important factors Control for incomplete data bias Assessment of outcome Total quality scores
Wu et al. (2015) [19] 1 1 0 1 2 1 2 8
Yuan (2014) [20] 3 0 0 1 2 1 2 9
Zhu (2014) [21] 3 0 0 1 2 1 2 9
Chao et al. (2013) [22] 1 0 0 1 2 1 2 7
Huang et al. (2013) [23] 2 0 0 1 2 1 2 8
Liu & Zhang (2013) [24] 1 0 0 1 1 1 2 6
Mi et al. (2013) [25] 1 0 0 1 2 1 2 7
Tao et al. (2013) [26] 2 0 0 1 2 1 2 8
Huang et al. (2012) [27] 1 0 0 1 1 1 2 6
Li (2012) [28] 3 1 0 1 2 1 2 10
Xu et al. (2012) [29] 2 0 0 0 2 1 2 7
Zhang et al. (2012) [30] 2 0 0 1 2 1 2 8
Wan (2011) [31] 3 0 0 1 2 1 2 9
  1. Student numbers, a maximum of 3 scores could be awarded for this item. Studies in which student numbers were 50 to 81, 96 to 113, 118 to 270 received 1 score, 2 scores, 3 scores, respectively; Control for important factors, a maximum of 2 scores could be awarded for this item. Studies which were controlled for age received 1 score, and studies which were controlled for previous academic performance received an additional score;
  2. Assessment of outcome, a maximum of 2 scores could be awarded for this item. Studies which were measured by examination scores received 1 score, and studies which were measured by both examination scores and questionnaire surveys received two scores