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Table 4 Newcastle-Ottawa Quality Assessment Form for Cohort Studies

From: What causes failure of fixed orthodontic retention? – systematic review and meta-analysis of clinical studies

Study   Renkema et al. 2011 [41] Farronato et al. 2014 [42] Kocher et al. 2019 [43]
Selection Representativeness of the exposed cohort 1 0 – not properly described 1
Selection of the non-exposed cohort 0 0 1
Ascertainment of exposure 1 1 1
Demonstration that outcome of interest was not present at start of study 1 1 1
Comparability Comparability of cohorts on the basis of the design or analysis controlled for confounders 0 0 2
There was only one cohort group, which was evaluated referring to different factors. There was only one cohort group, which was evaluated referring to different factors. The data collection and clinical evaluation were the same.
Outcome Assessment of outcome 1 1 1
Was follow-up long enough for outcomes to occur 1 1 1
Adequacy of follow-up of cohorts 1 1 1
Total= 6 5 9