Study | Jadad score (0–5) | Newcastle-Ottawa quality assessment scale cohort studies |
---|
| | Selection (0–4) | Comparability (0–2) | Outcome (0–3) | Total (0–9) |
Xiao et al. [19] | 2 | **** | ** | *** | 9 |
Nishigori et al. [20] | – | **** | * | *** | 8 |
Hidaka et al. [21] | – | **** | * | *** | 8 |
Zhao et al. [22] | – | **** | ** | *** | 9 |
- There is one star for each point, a study can be given a maximum of nine stars