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Table 9 Risk of lung cancer by number of years of smoking mentholated cigarettes among ever smokers for at least 20 years - Slone Epidemiology Center case-control study [53]

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

    Years of use of mentholated cigarettes
    Never 1-15 > 15 Ever a
Gender/Race No. of Cases Adjusted RR RR (CI) RR (CI) RR (CI)
Male/Both 435 Nob 1.00 0.58 (0.39-0.86) 0.62 (0.42-0.93) 0.60 (0.45-0.80)
   Age, racec 1.00 0.61 (0.41-0.90) 0.71 (0.48-1.06) 0.66 (0.49-0.88)
   Age, race and othersd 1.00 0.67 (0.43-1.05) 0.91 (0.57-1.46) 0.77 (0.55-1.08)
Female/Both 208 Nob 1.00 0.67 0.42-1.09) 0.75 (0.51-1.11) 0.72 (0.52-1.00)
   Age, racec 1.00 0.76 (0.47-1.23) 0.89 (0.60-1.32) 0.84 (0.60-1.16)
   Age, race and othersd 1.00 1.14 (0.66-1.95) 1.00 (0.63-1.60) 1.05 (0.72-1.55)
Both/White people 515 Nob 1.00 0.69 (0.49-0.98) 0.71 (0.50-1.01) 0.70 (0.54-0.91)
   Age, genderc 1.00 0.71 (0.50-1.01) 0.87 (0.61-1.24) 0.78 (0.60-1.01)
   Age, gender and othersd 1.00 0.86 (0.59-1.28) 1.01 (0.68-1.51) 0.93 (0.69-1.24)
Both/Black people 128 Nob 1.00 0.40 (0.21-0.74) 0.50 (0.32-0.79) 0.46 (0.31-0.69)
   Age, genderc 1.00 0.52 (0.28-0.97) 0.69 (0.44-1.09) 0.63 (0.42-0.94)
   Age, gender and othersd 1.00 0.60 (0.27-1.35) 1.21 (0.64-2.26) 0.91 (0.52-1.59)
Both/Both 643 Nob 1.00 0.59 (0.43-0.79) 0.60 (0.46-0.79) 0.59 (0.48-0.74)
   Age, race and genderc 1.00 0.65 (0.48-0.88) 0.76 (0.58-1.00) 0.70 (0.57-0.88)
   Age, race, gender and othersd 1.00 0.80 (0.57-1.13) 0.97 (0.70-1.34) 0.89 (0.69-1.14)
  1. aExcept for the final estimates in this column, all RRs and CIs were derived as described in additional file 1: Methods for deriving RR estimates.
  2. b All unadjusted RRs and CIs were derived as described in additional file 1: Methods for deriving RR estimates.
  3. cThe width of the estimated CI is taken to be the same as the width of the unadjusted estimate, so may be slightly understated.
  4. d The other adjustment factors were year at interview, duration of smoking, cigarettes per day, years since quitting and proportion of years smoked filter cigarettes.