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Table 5 Scores for assessment of quality for case control studies using the Newcastle Ottawa Scale

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

  Jory & McGinnis 2008 Rose et al. 2008 Vojdani et al. 2008 James et al. 2009 James et al. 2009 (in vitro) Al-Gadani et al. 2009 Pasca et al. 2009 Pastural et al. 2009 Geier & Geier 2009 Adams et al. 2009 Mostafa et al. 2010 Vergani et al. 2011 Al-Yafee et al. 2011 Adams et al. 2011 Tirouvanzium et al. 2011 Max score
1 Selection                 
   Case definition 1 1 1 1 2 2 2 1 2 1 2 1 2 1 1 2
   Representativeness 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1
   Selection of controls 0 0 1 0 0 0 0 0 0 0 1 0 1 0 0 2
   Definition of controls 0 0 0 1 1 0 1 0 0 0 1 1 1 2 1 2
2 Comparability                 
   Control for confounding 0 0 0 1 1 1 2 0 0 0 2 0 0 0 2 2
3 Exposure                 
   Ascertainment 0 0 0 0 0 0 0 0 0 1 0 0 0 1 0 1
   Method same for cases/controls 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
   Overall score 2 2 3 4 5 4 6 2 3 3 7 3 5 5 5 9