| 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 | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â |
   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 | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â |
   Control for confounding | 0 | 0 | 0 | 1 | 1 | 1 | 2 | 0 | 0 | 0 | 2 | 0 | 0 | 0 | 2 | 2 |
3 Exposure | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â |
   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 |