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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