Table 2 Quality assessment according to Newcastle-Ottawa Scale
Study | Q1 | Q2 | Q3 | Q4 | Q5 | Q6 | Q7 | Q8 | Total |
|---|---|---|---|---|---|---|---|---|---|
Bonthuis et al. (2010) [21] | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 9 |
Breslow et al. (2000) [22] | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 0 | 8 |
Chow et al. (1992) [23] | 1 | 1 | 1 | 1 | 2 | 0 | 1 | 1 | 8 |
Kelemen et al. (2005) [24] | 0 | 1 | 1 | 1 | 2 | 0 | 1 | 0 | 6 |
Kojima et al. (2004) [25] | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 9 |
Matsumoto et al. (2007) [26] | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 9 |
Park et al. (2007) [27] | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 0 | 8 |
Praagman et al. (2015) [28] | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 9 |
Sharma et al. (2013) [29] | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 0 | 8 |
Song et al. (2013) [30] | 0 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 8 |
Wang et al. (2015) [31] | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 9 |