Table 2 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 | ||
Steidl et al. [10] | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 9 |
Tzankov et al. [11] | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 1 | 1 | 6 |
Kamper et al. [12] | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 8 |
Hohaus et al. [13] | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 0 | 0 | 5 |
Zaki et al. [23] | 0 | 1 | 1 | 1 | 0 | 0 | 0 | 1 | 0 | 4 |
Azambuja et al. [24] | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 8 |
Yoon et al. [14] | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 1 | 8 |
Tan et al. [15] | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 9 |
Sanchez-Espiridion et al. [31] | 0 | 1 | 1 | 1 | 0 | 0 | 0 | 1 | 0 | 4 |
Abdou et al. [16] | 0 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 3 |
Greaves et al. [17] | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 9 |
Deau et al. [25] | 0 | 1 | 1 | 1 | 0 | 0 | 0 | 1 | 0 | 4 |
Panico et al. [26] | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 0 | 6 |
Casulo et al. [18] | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 0 | 7 |
Koh et al. [19] | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 0 | 6 |
Ping et al. [27] | 0 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 0 | 5 |
Klein et al. [28] | 0 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 1 | 6 |
Touati et al. [20] | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 1 | 1 | 6 |
Kayal et al. [30] | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 0 | 6 |
Agur et al. [29] | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 1 | 7 |
Moreno et al. [21] | 0 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 0 | 5 |
Jakovic et al. [22] | 1 | 1 | 1 | 1 | 0 | 1 | 0 | 1 | 0 | 6 |