Table 3 Quality assessment of the observational studies using the Newcastle-Ottawa Scale (NOS). Assessment of the cohort studies
Author | year | Representativeness of the exposed cohort | Selection of the non-exposed cohort | Ascertainment of exposure to implants | Demonstration that outcome of interest was not present at start of study | Comparability of cohorts | Assessment of outcome | Was follow up long enough for outcomes to occur | Adequacy of follow up of cohorts | Total score | |
|---|---|---|---|---|---|---|---|---|---|---|---|
Chan et al. [17] | 2009 | + | + | + | + | + | – | + | + | + | 8 |
Coghill et al. [14] | 2011 | + | + | + | + | + | – | + | + | + | 8 |
Bains et al. [6] | 2016 | + | + | + | + | + | – | + | + | + | 8 |
Liao et all [20]. | 2012 | + | + | + | + | + | – | + | + | + | 8 |
Walker et al. [20] | 2012 | + | + | – | – | + | + | + | – | + | 6 |
Domingo et al. [18] | 2013 | + | + | – | + | + | + | + | – | + | 7 |
Frouws et al. [7] | 2017 | + | + | – | + | + | + | + | – | + | 7 |
Gray et al. [23] | 2018 | + | + | – | – | + | – | + | + | + | 6 |
Kothari et al. [21] | 2014 | + | + | – | – | + | – | + | + | + | 6 |
McCowan et al. [19] | 2013 | + | + | – | + | + | + | + | – | + | 7 |
Macfarlane et al. [13] | 2015 | + | + | – | – | + | – | + | + | + | 6 |
Newcomb et al. [14] | 2017 | + | + | + | + | + | – | + | + | + | 8 |
Reimers et al. [5] | 2014 | + | + | – | + | + | + | + | – | + | 7 |
Spence et al. [11] | 2017 | + | + | + | + | + | + | + | – | + | 8 |
Zell et al. [15] | 2009 | + | + | – | + | + | + | + | – | + | 7 |
Joseph et al. [24] | 2019 | + | + | – | + | + | + | + | – | + | 7 |