Table 2.
Newcastle-Ottawa Scale Assessment of enrolled studies
| Ref. |
Selection (0-4) |
Comparability |
Outcome (0-3) |
Total | ||||||
| REC | Snec | AE | OINP | SCB | SCA | AO | FU | AFC | ||
| Kim et al[10] | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 1 | 8 |
| Lin et al[11] | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 8 |
| Hsiao et al[12] | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 1 | 8 |
| Takahashi et al[13] | 1 | 1 | 1 | 0 | 1 | 0 | 1 | 1 | 1 | 7 |
| Khoo et al[14] | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 9 |
REC: Representativeness of the exposed cohort; SNEC: Selection of the no exposed cohort; AE: Ascertainment of exposure; OINP: Outcome of interest not presented in the start of study; SCB: Study controls for basic characteristics; SCA: Study controls for additional factor; AO: Assessment of outcome; FU: Follow-up; AFC: Adequacy of follow up.