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Table 3 Methodological quality assessment of case–control studies using the Newcastle-Ottawa Scale

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

Study Vibert 2003[15] Jeong 2009[12] Mikulec 2010[13] Yamanaka 2013[16] Stefano 2013[17]
Is the case definition adequate?
Representativeness of the cases    
Selection of controls      
Definition of controls
Comparability of cases and controls on the basis of the design or analysis
Ascertainment of exposure  
Same method of ascertainment for cases and controls
Non-response rate      
Total number of star 6 7 5 6 7
  1. Study quality was graded as poor (1–3 stars), intermediate (4–6 stars) or high (7–9 stars).