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 | ||
Ladoire S et al. [26] | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 0 | 0 | 5 |
Lee S et al. [30] | 0 | 1 | 1 | 0 | 0 | 0 | 1 | 1 | 0 | 4 |
Mahmoud SMA et al. [27] | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 0 | 6 |
Liu F et al. [7] | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 0 | 7 |
West NR et al. [32] | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 0 | 6 |
Bates GJ et al. [23] | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 0 | 6 |
Takenaka M et al. [31] | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 0 | 6 |
Maeda N et al. [35] | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 0 | 6 |
Sun S et al. [36] | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 1 | 8 |
Aruga T et al. [24] | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 1 | 0 | 5 |
De Kruijf EM et al. [25] | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 0 | 7 |
Liu F et al. [28] | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 0 | 6 |
Liu S et al. [34] | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 0 | 6 |
Kim ST et al. [29] | 0 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 3 |
Tsang JY et al. [37] | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 4 |
Kim S et al. [33] | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 1 | 0 | 5 |
Seo AN et al. [38] | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 4 |