Table 2 Newcastle Ottawa Scale (NOS) for Quality Assessment
Study | Selection | Comparability | Outcome | Total | |||||
|---|---|---|---|---|---|---|---|---|---|
Representativeness of the exposed cohort | Selection of the non-exposed cohort | Ascertainment of exposure | Demonstration that outcome of interest was not present at the start of the study | Comparability of cohorts based on the design or analysis | Assessment of outcome | Duration of follow-up enough for outcomes to occur | Adequate follow-up | ||
Full score | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 9 |
Jeffres et al. [42] (2006) | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 7 |
Hermsen et al. [43] (2010) | 1 | 1 | 1 | 1 | 2 | 1 | 0 | 1 | 8 |
Kullar et al. [44] (2011) | 1 | 1 | 1 | 1 | 2 | 0 | 1 | 1 | 8 |
Clemens et al. [45] (2011) | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 8 |
Hou et al. [46] (2021) | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 9 |
Wang et al. [47] (2021) | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 9 |
Huang et al. [48] (2018) | 1 | 1 | 1 | 1 | 2 | 1 | 0 | 1 | 8 |
Chuma et al. [49] (2018) | 1 | 1 | 1 | 1 | 2 | 1 | 0 | 1 | 8 |
Yahav et al. [50] (2019) | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 9 |
Arasteh et al. [51] (2019) | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 9 |
Kralovicova et al. [52] (1997) | 1 | 1 | 1 | 1 | 2 | 1 | 0 | 1 | 8 |
Bosso et al. [53] (2011) | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 8 |
Chung et al. [54] (2011) | 1 | 1 | 1 | 1 | 2 | 1 | 0 | 1 | 8 |
Arshad et al. [55] (2012) | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 9 |