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Table 3 Risk of bias assessment*

From: Acupuncture for ankle sprain: systematic review and meta-analysis

  Sun (2011)[24] Zheng (2010)[25] He (2010)[36] Wei (2010)[37] Ni (2010)[26] Tang (2010)[38] Luo (2009)[27] Zhou (2008)[28] He (2006)[29] Zhao (2005)[30] Wang (2005)[39] Li (2002)[31] Ge (2000)[32] Yu (1999)[33] Yu (1999)[34] Yu (1996)[35] Ruan (1995)[40]
1. Was the method of randomization adequate? Y U Y U U U U U U U U Y U U U U U
2. Was the treatment allocation concealed? Y U U U U N N U U N U U U U U U U
3. Was the patient blinded to the intervention? N N N N N N N N N N N N N N N N N
4. Was the outcome assessor blinded to the intervention? U U N U U U N U U N U U U U U U U
5. Were incomplete outcome data adequately addressed? N Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y
6. Are reports of the study free of suggestion of selective outcome reporting? N N Y N N N Y Y N Y Y Y Y Y Y Y Y
  1. *, Based on the risk of bias assessment tool from the Cochrane Handbook for Systematic Reviews of Interventions [16]; ‘Y’ indicates “Yes (low risk of bias)”; ‘U’, “Unclear”; ‘N’, “No (high risk of bias)”; A study with a low risk of bias was defined as a study receiving ‘Y’ for randomization and/or allocation concealment.