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Table 15 Summary of the main features of the epidemiological studies of cigarette mentholation and lung cancer

From: Systematic review of the epidemiological evidence comparing lung cancer risk in smokers of mentholated and unmentholated cigarettes

Characteristic Level N (%) Characteristic Level N (%)
Study design    Cases in mentholated cigarette smokers   
  Prospective cohort 2 (25.0)   50-124 4 (50.0)
  Hospital case-control 3 (37.5)   125+ 4 (50.0)
  Population case-control 3 (37.5)    
    Controls matched on age and gender   
Country     Yes 5 (62.5)
  USA 7 (87.5)   No 1 (12.5)
  Germany 1 (12.5)   Prospective 2 (25.0)
First year of study    Menthol dose-response studied   
  1979 to 1985 3 (37.5)   Yes 4 (50.0)
  1986 to 1995 4 (50.0)   No 4 (50.0)
  Not known 1 (12.5)    
    Race accounted for   
Year of publication     Yes 8 (100.0)
  1991 to 2000 3 (37.5)    
  2001 to 2008 5 (62.5) Smoking adjusted for   
     Yes 8 (100.0)
Genders studied      
  Both 8 (100.0)    
    Age adjusted for Yes 8 (100.0)
Smoking groups used in analysis      
  Current 4 (50.0) Results by histological type Yes 1 (12.5)
  Ever 4 (50.0)   No 7 (87.5)
Cases studied      
  200-499 4 (50.0) NOS study quality score 7 to 9 3 (37.5)
  500-999 1 (12.5)   5 to 6 5 (62.5)
  1000+ 3 (37.5)