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Table 2 Assessment of risk of bias of observational studies with the Newcastle-Ottawa Scale

From: Post-orthodontic lower incisor inclination and gingival recession—a systematic review

  Allais and Melsen [20] Villard and Patcas [22]
Design Cohort study Cohort study
Selection Representativeness of the study group * *
Selection of the controls * *
Ascertainment of exposure * *
Definition of baseline characteristics   *
Comparability Comparability for gingival recessions * *
Comparability for incisor inclination *  
Outcome Assessment of outcome * *
Adequacy of follow-up   *
Attrition during follow-up * *
Total 7 8