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Table 4 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

  Golse et al. 1978 Sankar et al. 1979 Khaleel uddin & Philpot 1980 Rolf et al. 1993 Visconti et al. 1994 D'Eufe mia et al. 1995 Yorbik et al. 2002 Sogut et al. 2003 Aldred et al. 2003 James et al. 2004 Adams et al. 2004 James et al. 2006 Pasca et al. 2006 Shinohe et al. 2006 Adams et al. 2006 Adams et al. 2007 Rossign ol et al. 2007 Suh et al.2008
1. Selection                   
Case definition 0 2 0 1 2 2 1 2 1 1 1 1 1 2 1 2 1 1
Representativeness 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Selection of controls 0 0 1 0 0 0 1 1 1 0 0 0 0 2 0 0 0 1
Definition of controls 0 0 1 1 1 2 1 1 1 1 0 0 1 2 0 1 0 2
2. Comparability                   
Control for confounding 0 0 0 1 0 0 0 0 1 0 2 0 0 2 0 0 0 0
3. Exposure                   
Ascertainment 0 1 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0
Method same for cases/controls 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
Overall score 1 4 3 4 4 5 4 5 5 3 4 2 2 9 3 4 2 5