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Table 2 Methodological quality assessment of cohort studies using the Newcastle-Ottawa Scale

From: Association between osteoporosis and benign paroxysmal positional vertigo: a systematic review

Study Jang 2009[11] Parham 2013[14]
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
Ascertainment of exposure
Was follow-up long enough for outcomes to occur   
Adequacy of follow up of cohorts   
Total number of star 5 5
  1. Study quality was graded as poor (1–3 stars), intermediate (4–6 stars) or high (7–9 stars).