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Table 6 Quality assessment of included studies using the Newcastle-Ottawa scale

From: Management of Schneiderian membrane perforations during maxillary sinus floor augmentation with lateral approach in relation to subsequent implant survival rates: a systematic review and meta-analysis

  Park et al. [4] Beck-Broichsitter et al. [47] Ferreira et al. [16] Öncü E et al. [19] Froum et al. [48] Oh E et al. [49] Hernández-Alfaro et al. [50]
Selection
• Representativeness of the exposed cohort 0 0 0 0 * 0 *
• Selection of the non-exposed cohort * * * * * * *
• Ascertainment of exposure * * * * * * *
• Demonstration that outcome of interest was not present at start of study * * * * * * *
Comparability
• Study controls for bone ring group 0 0 0 0 0 0 0
• Study controls for any additional factor (duration of exposure) * * * * * * *
Outcome
• Assessment of outcome 0 0 0 0 0 0 *
• Was follow-up long enough for outcomes to occur? * * * 0 * * 0
• Adequacy of follow-up of cohorts * * * * * * *
Newcastle-Ottawa scale 6 6 6 5 7 6 7
  1. 0 no
  2. *Yes