Table 3 Quality assessment of included cohort studies
From: A comparison of treatment effectiveness between clear aligner and fixed appliance therapies
| Reference | Selection | Comparability | Outcome | Total score | |||||
|---|---|---|---|---|---|---|---|---|---|
| Representativeness of the exposed cohort | Selection of the non-exposed cohort | Ascertainment of exposure | 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 for outcomes to occur | Adequacy of follow up of cohorts | ||
| Djeu2005 | * | * | * | * | * | * | * | * | 8 |
| Kuncio2007 | * | * | * | * | ** | * | * | 8 | |
| Pavoni2011 | * | * | * | * | * | * | 6 | ||
| Grunheid2016 | * | * | * | ** | * | * | * | 8 | |
| Gu2017 | * | * | * | * | * | * | * | * | 8 |
| Lanteri2018 | * | * | * | ** | * | * | * | 8 | |
