Table 2.
Quality assessment of included studies based on the Newcastle‐Ottawa scale
| Author/Year | Selection | Comparability | Outcome | NOS | |||||
|---|---|---|---|---|---|---|---|---|---|
| Representative‐ness of the exposed cohort | Selection of the non exposed cohort | Ascertain‐ment of exposure to implants | Demonstration that outcome of interest was not present at start of study | Comparability of cohorts on the basis of the design or analysis | Assessment of outcome | Was follow‐up long enough follow‐up for outcome to occur | Adequacy of follow‐up of cohorts | ||
| Aliberti et al. (2019) | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 9 |
| Avila‐Funes et al. (2009) | 1 | 1 | 1 | 0 | 2 | 1 | 0 | 1 | 7 |
| Downer et al. (2019) | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 7 |
| Esteban‐Cornejo et al. (2019) | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 8 |
| Hao et al. (2018) | 0 | 1 | 1 | 1 | 2 | 1 | 0 | 1 | 7 |
| Lee et al. (2018) | 1 | 1 | 1 | 1 | 2 | 1 | 0 | 1 | 8 |
| Liu et al. (2018) | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 7 |
| Montero‐Odasso et al. (2016) | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 7 |
| Okura et al. (2019) | 1 | 1 | 0 | 1 | 1 | 1 | 0 | 1 | 6 |
| Shimada et al. (2018) | 1 | 1 | 1 | 1 | 2 | 1 | 0 | 1 | 8 |
| Solfrizzi et al. (2017) | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 9 |
| St John et al. (2017) | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 8 |
| Tsutsumimoto et al. (2020) | 1 | 1 | 1 | 1 | 2 | 1 | 0 | 1 | 8 |
| Yu et al. (2018) | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 8 |