Table 2 The assessment of the risk of bias in each Cohort study using the Newcastle-Ottawa Scale
Study | Selection (0–4) | Comparability (0–2) | Outcome (0–3) | Total | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
REC | SNEC | AE | DO | SC | AF | AO | FU | AFU | Â | |
Kust 2016 [20] | 0 | 1 | 1 | 1 | 0 | 0 | 0 | 1 | 0 | 4 |
Liu 2013 [28] | 0 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 0 | 5 |
Yokobori 2013 [29] | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 0 | 6 |
Shimada 2012 [19] | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 1 | 7 |
Iimuna 2011 [30] | 0 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 0 | 5 |
Uen 2008 [31] | 0 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 0 | 5 |
Barreto 2007 [32] | 0 | 0 | 1 | 1 | 0 | 0 | 1 | 1 | 0 | 4 |
Koch 2006 [33] | 0 | 1 | 1 | 1 | 0 | 0 | 1 | 0 | 0 | 4 |
Lloyd 2006 [34] | 0 | 0 | 1 | 1 | 0 | 0 | 1 | 0 | 0 | 3 |
Sadahrio 2005 [35] | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 1 | 7 |
Bessa 2003 [36] | 0 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 0 | 5 |
Ito 2002 [37] | 0 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 0 | 5 |