Table 1.
Quality assessment of included studies using NOS tool.
| Study | Selection domain (max of 4 points) | Comparability domain (max of 2 points) | Outcome domain (max of 3 points) | Quality rating |
|---|---|---|---|---|
| Kim et al. [12] | **** | *- | *-* | Fair |
| van de Putte et al. [13] | **** | *- | *-* | Fair |
| Galsky et al. [14] | *-** | ** | ∗-- | Poor |
| Gandhi et al. [15] | **** | ** | **- | Good |
| Chau et al. [16] | **** | ** | ∗-- | Poor |
| Khaled et al. [17] | NA | NA | NA | NA |
| Fairey et al. [18] | **** | *- | *-* | Fair |
| Pal et al. [19] | **** | ** | *-* | Good |
| Matsubara et al. [20] | **** | *- | *-* | Fair |
| Scosyrev et al. [21] | **** | -- | *-* | Poor |
| Kaneko et al. [22] | **** | -- | *-* | Poor |
| Dash et al. [7] | **** | ** | *-* | Good |
| Herchenhorn et al. [23] | NA | NA | NA | NA |
*, Each single symbol represents 1 point assigned for the domain; NA, not applicable; -, each single symbol represents no point scored; NOS, New Castle Ottawa Scale.