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Table 1 Cochrane quality scale for randomized controlled studies

From: A meta-analysis of the resuscitative effects of mechanical and manual chest compression in out-of-hospital cardiac arrest patients

Study Allocation generation Allocation concealment Blinding of participants Blinding of assessors Outcome complete Outcome selective Other biases
1998 Edward T High High Unclear Unclear High Unclear High
2006 Al Hallstrom Medium Medium Unclear Unclear Medium Unclear Unclear
2011 David Smekal Medium Low Unclear Unclear Medium Unclear Unclear
2014 Lars Wik Medium Low Unclear Unclear Medium Unclear Unclear
2014 Sten Rubertsson Medium Low Unclear Unclear Medium Unclear Unclear
2015 Gavin D Perkins Low Low Unclear Unclear Low Unclear Unclear
2016 Venkataraman Medium Medium Unclear Unclear Medium Unclear Unclear
2016 Chengjin Gao Low High Unclear Unclear Medium Unclear Unclear
2017 Bjarne Medium High Unclear Unclear Medium Unclear Unclear