Table 2 Newcastle–Ottawa Scale to assess quality of studies involved in systematic review
| Â | Selection | Outcome | |||||||
|---|---|---|---|---|---|---|---|---|---|
Representativeness of expressed cohort | Selection of non expressed cohort | Ascertainment of exposure | Outcome not present at the start of the study | Comparability | Assessment of outcomes | Length of follow-up | Adequacy of follow-up | Total score | |
Maiti et al. [25] | a | a | a | a | a | a | a | a | 8 |
Torre-Fuentes et al. [6] | b | a | a | a | a | a | a | a | 8 |
Gomez et al. [7] | b | a | a | a | a | a | a | a | 8 |
Zhang et al. [8] | b | a | a | a | a | a | a | a | 8 |
Hussain et al. [11] | b | a | a | a | a | a | a | a | 8 |
Gomez et al. [9] | b | a | a | a | a | a | a | a | 8 |
Wang et al. [12] | a | a | a | a | a | a | a | a | 8 |
Fujikura et al. [15] | a | a | a | a | a | a | a | a | 8 |
Yamamoto et al. [16] | b | a | a | a | a | a | a | a | 8 |
Sienko et al. [17] | a | a | a | a | a | a | a | a | 8 |
Paniri et al. [18] | a | a | a | a | a | a | a | a | 8 |
Nguyen et al. [10] | b | a | a | a | a | a | a | a | 8 |
Senapati et al. [19] | b | a | a | a | a | a | a | a | 8 |
Novelli et al. [20] | b | a | a | a | a | a | a | a | 8 |
Vargas-Alarcón et al. [21] | b | a | a | a | a | a | a | a | 8 |
Benetti et al. [22] | b | a | a | a | a | a | a | a | 8 |
Strafella et al. [13] | b | a | a | a | a | a | a | a | 8 |
Shikov et al. [23] | b | a | a | a | a | a | a | a | 8 |
Srivastava et al. [14] | b | a | a | a | a | a | a | a | 8 |
Yang et al. [26] | b | a | a | a | a | a | a | a | 8 |
Kim et al. [24] | a | a | a | a | a | a | a | a | 8 |