Table 4.
Scores for assessment of quality for case control studies using the Newcastle Ottawa Scale
| 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 |