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Table 7 Scores for assessment of risk of bias for intervention studies

From: The potential role of the antioxidant and detoxification properties of glutathione in autism spectrum disorders: a systematic review and meta-analysis

Risk of bias Bertoglio et al. 2011 James et al. 2009 Adams et al. 2009 Rossignol et al. 2007 James et al. 2004
Randomisation Uncertain Open label Uncertain Open label Open label
Concealment of allocation Low risk Open label Low risk Open label Open label
Blinding Low risk Open label Low risk Open label Open label
Incomplete outcome data High risk Low risk High risk Low risk Low risk
Selective reporting High risk Low risk High risk Low risk Low risk
Overall score 5 4 5 4 4
  1. Scoring
  2. Low risk = 2; Uncertain = 1; High risk/open label = 0