Table 1 Quality assessment for eligible studies based on Newcastle-Ottawa-Scale (NOS)
Study number | First author | Year | Selection Bias assessment (Maximum 4 stars) | Comparability (Maximum 2 stars) | Outcome (Maximum 3 stars) | Total score (Maximum 10 stars) | References | |||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Is the case definition adequate? | Representativeness of the cases | Selection of controls | Definition of controls | Comparability of cases and controls on the basis of design or analysis | Assessment of the exposure | Same method of ascertainment for cases and controls | Non-response rate | |||||
Score | Score | Score | Score | Score | Score | Score | Score | |||||
1 | Jong | 1996 | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 9 | [40] |
2 | Peng | 1998 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 7 | [41] |
3 | Lamarque | 1999 | 1 | 0 | 1 | 0 | 1 | 1 | 1 | 0 | 5 | [42] |
4 | Doorn | 1999 | 1 | 0 | 0 | 1 | 2 | 1 | 1 | 1 | 7 | [43] |
5 | Schmaußer | 2000 | 1 | 0 | 1 | 1 | 1 | 1 | 1 | 0 | 6 | [44] |
6 | Delchier | 2001 | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 9 | [45] |
7 | Koehler | 2003 | 1 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 7 | [46] |
8 | Lehours | 2009 | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 0 | 8 | [47] |
9 | Talebi | 2013 | 1 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 7 | [48] |
10 | Hashinaga | 2016 | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 0 | 8 | [49] |