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Table 3 Quality Assessment of the Included Articles

From: Association of COL9A3 trp3 polymorphism with intervertebral disk degeneration: a meta-analysis

Author Year A B C D E F G H I J Sum
Bagheri et al. [18] 2016 1 0 1 1 1 0 0 1 1 0 6
Solovieva et al. [14] 2006 1 1 1 1 1 0 0 1 1 0 7
Kales et al. [27] 2004 1 0 1 1 1 0 0 1 1 0 6
Paassita et al. [17] 2001 1 0 1 1 1 0 0 1 0 0 5
Kelempisioti et al. [30] 2011 0 1 1 1 1 0 0 1 1 0 6
Matsui et al. [28] 2004 0 0 1 1 1 1 0 1 0 0 5
Eskola et al. [21] 2010 1 1 1 1 1 0 0 1 1 0 7
Rathod et al. [22] 2012 1 0 1 1 1 0 0 1 1 0 6
Zhu et al. [29] 2011 0 0 1 1 1 0 0 1 1 0 5
Jim et al. [23] 2005 1 0 1 1 1 0 0 1 1 0 6
Toktas et al. [11] 2015 0 0 1 1 1 0 0 1 1 0 5
  1. Abbreviations: A Control group, B Hardy–Weinberg equilibrium, C Case group, D Primer, E Reproducibility, F Blinding, G Power calculation, H Statistics, I Corrected statistics, J Independent replication, Sum sum of quality assessment score, 1 done, 0 undone or unclear