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

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]

			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	No^b	1.00	0.58 (0.39-0.86)	0.62 (0.42-0.93)	0.60 (0.45-0.80)
		Age, race^c	1.00	0.61 (0.41-0.90)	0.71 (0.48-1.06)	0.66 (0.49-0.88)
		Age, race and others^d	1.00	0.67 (0.43-1.05)	0.91 (0.57-1.46)	0.77 (0.55-1.08)
Female/Both	208	No^b	1.00	0.67 0.42-1.09)	0.75 (0.51-1.11)	0.72 (0.52-1.00)
		Age, race^c	1.00	0.76 (0.47-1.23)	0.89 (0.60-1.32)	0.84 (0.60-1.16)
		Age, race and others^d	1.00	1.14 (0.66-1.95)	1.00 (0.63-1.60)	1.05 (0.72-1.55)
Both/White people	515	No^b	1.00	0.69 (0.49-0.98)	0.71 (0.50-1.01)	0.70 (0.54-0.91)
		Age, gender^c	1.00	0.71 (0.50-1.01)	0.87 (0.61-1.24)	0.78 (0.60-1.01)
		Age, gender and others^d	1.00	0.86 (0.59-1.28)	1.01 (0.68-1.51)	0.93 (0.69-1.24)
Both/Black people	128	No^b	1.00	0.40 (0.21-0.74)	0.50 (0.32-0.79)	0.46 (0.31-0.69)
		Age, gender^c	1.00	0.52 (0.28-0.97)	0.69 (0.44-1.09)	0.63 (0.42-0.94)
		Age, gender and others^d	1.00	0.60 (0.27-1.35)	1.21 (0.64-2.26)	0.91 (0.52-1.59)
Both/Both	643	No^b	1.00	0.59 (0.43-0.79)	0.60 (0.46-0.79)	0.59 (0.48-0.74)
		Age, race and gender^c	1.00	0.65 (0.48-0.88)	0.76 (0.58-1.00)	0.70 (0.57-0.88)
		Age, race, gender and others^d	1.00	0.80 (0.57-1.13)	0.97 (0.70-1.34)	0.89 (0.69-1.14)

^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.
^b All unadjusted RRs and CIs were derived as described in additional file 1: Methods for deriving RR estimates.
^cThe width of the estimated CI is taken to be the same as the width of the unadjusted estimate, so may be slightly understated.
^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.

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