Risk of lung cancer among women in relation to lifetime history of tobacco smoking: a population-based case-control study in France (the WELCA study)

Table 3 Combined effects of smoking intensity and smoking duration on lung cancer among ever smokers

EVER SMOKERS ^b	INTENSITY (cigarettes/day)
	< 10		10–19		≥20
	Cases/Controls	OR (95%CI) ^a	Cases/Controls	OR (95%CI) ^a	Cases/Controls	OR (95%CI) ^a
DURATION (years)
< 20	23/81	1.00 (Ref)	26/41	2.08 (1.03; 4.19)	13/28	1.74 (0.76; 3.99)
20–39	36/65	1.62 (0.86; 3.07)	134/65	6.17 (3.50; 10.89)	88/40	7.50 (4.06; 13.87)
≥ 40	21/29	2.47 (1.16; 5.26)	126/44	10.26 (5.61; 18.75)	107/22	19.02 (9.66; 37.46)
p _interaction intensity*duration	0.012

Abbreviations: CI confidence interval, OR odds ratio
^a Odds ratios adjusted for age (continuous), area of residence, education, and BMI 2 years before the interview (continuous)
^b Ever smoker correspond to a person who have smoked at least 100 cigarettes throughout life

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